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TRB Physics 2009

2009 · 151 questions · First 10 Solutions Free
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Q1 mcq
Who was the Viceroy of India, when the Rowlatt Act was passed?
a.
Lord Irwin
b.
Lord Chelmsford Correct Answer
c.
Lord Wavell
d.
Lord Wellington
Step-by-Step AI Explanation
Verified Method
The Rowlatt Act was passed in 1919, when Lord Chelmsford was the Viceroy of India. Lord Irwin became Viceroy later, in 1926.
Q2 mcq
Which one of the following is the softest?
a.
Sodium
b.
Aluminium
c.
Iron
d.
Lithium Correct Answer
Step-by-Step AI Explanation
Verified Method
Among the listed metals, lithium is the softest. Alkali metals are generally very soft, and lithium is softer than sodium, aluminium, and iron.
Q3 mcq
As a non-member who can participate in the proceedings of either House of Parliament?
a.
Vice-President
b.
Chief Justice
c.
Attorney General Correct Answer
d.
Chief Election Commissioner
Step-by-Step AI Explanation
Verified Method
The Attorney General of India has the right to participate in the proceedings of either House of Parliament, though without voting rights.
Q4 mcq
Which is the river on which Indira Sagar Dam is planned to be constructed?
a.
Mahanadi
b.
Godavari
c.
Krishna
d.
Narmada Correct Answer
Step-by-Step AI Explanation
Verified Method
The Indira Sagar Dam is on the Narmada River in Madhya Pradesh.
Q5 mcq
The first astronomer who gave the idea, 'The earth rotates on its axis', is
a.
Bhaskara
b.
Aryabhatta Correct Answer
c.
Varahamihira
d.
Kalpana Chawla
Step-by-Step AI Explanation
Verified Method
Aryabhatta proposed that the earth rotates on its axis. The other options are not correct for this historical contribution.
Q6 mcq
Which one of the following angles cannot be constructed using an unmarked ruler and compass only?
a.
75°
b.
90°
c.
50° Correct Answer
d.
22 1/2°
Step-by-Step AI Explanation
Verified Method
Using only an unmarked ruler and compass, standard constructible angles include 90°, 45°, 30°, 60°, and angles derived from them such as 75° and 22 1/2°. A 50° angle is not generally constructible by these methods.
Q7 mcq
For a Frequency Polygon, the points are plotted against
a.
mid-point of the class interval vs frequency Correct Answer
b.
lower limit of the class interval vs frequency
c.
upper limit of the class interval vs frequency
d.
real limit of the class interval vs frequency
Step-by-Step AI Explanation
Verified Method
A frequency polygon is drawn by plotting frequency against the class mid-points (class marks) and joining the plotted points with straight lines.
Q8 mcq
AICTE was established in
a.
November, 1945
b.
November, 1955
c.
November, 1985 Correct Answer
d.
November, 1975
Step-by-Step AI Explanation
Verified Method
AICTE was established in 1985. Among the given options, November 1985 is the correct one.
Q9 mcq
One of the main publications of John Dewey is
a.
Secrets of Childhood
b.
Education Today Correct Answer
c.
Education of Man
d.
The Social Contract
Step-by-Step AI Explanation
Verified Method
John Dewey is associated with educational works such as Education Today. The Social Contract is by Rousseau, and the other options are not Dewey's main publications.
Q10 mcq
According to David Ausubel, 'Verbal Learning' is
a.
learning a new language
b.
oral practice
c.
understanding verbal information Correct Answer
d.
passive learning experience
Step-by-Step AI Explanation
Verified Method
In Ausubel's theory, verbal learning refers to learning meaningful verbal information, not mere rote oral practice or passive reception.
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Q11 mcq
The Southern Regional Office of UGC is in
a.
Hyderabad
b.
Bangalore
c.
Chennai
d.
Mumbai
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Q12 mcq
National Population Policy was evolved in the year
a.
1976
b.
1979
c.
1986
d.
1977
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Q13 mcq
According to Abraham Maslow, 'Self-Actualisation' in the hierarchy is
a.
first step
b.
final step
c.
third step
d.
fourth step
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Q14 mcq
Who is the author of 'Emile'?
a.
Dewey
b.
Bertrand Russell
c.
Froebel
d.
Rousseau
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Q15 mcq
The university that has no affiliated colleges is
a.
Madras University
b.
Madurai Kamaraj University
c.
Thanjavur Tamil University
d.
Manonmanium Sundaranar University
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Q16 mcq
Human Rights Day is
a.
December 10
b.
December 7
c.
December 26
d.
July 17
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Q17 mcq
Which one of the following models is not on curriculum development?
a.
The Tylor model
b.
The Ausubel's model
c.
The Taba model
d.
The Hunkin's model
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Q18 mcq
The chief objective of pre-primary education is to promote ..................... of the child.
a.
physical development
b.
mental development
c.
social development
d.
overall development
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Q19 mcq
If the teacher finds in learner's activities something new or original, then the child is supposed to be
a.
intelligent
b.
creative
c.
critical
d.
motivated
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Q20 mcq
Which one of the following is not a learning domain?
a.
Cognitive domain
b.
Psychomotor domain
c.
Physiological domain
d.
Affective domain
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Q21 mcq
The magnetic permeability $\mu_a$ is
a.
$\mu_a = I/H$
b.
$\mu_a = H/I$
c.
$\mu_a = B/H$
d.
$\mu_a = H/B$
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Q22 mcq
According to De Morgan's second theorem $\overline{A \cdot B} =$
a.
$\overline{A} \cdot \overline{B}$
b.
$A + B$
c.
$\overline{A} + B$
d.
$\overline{A} + \overline{B}$
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Q23 mcq
It is a type of machine in which the frequency of electric field is kept constant and magnetic field is varied. It is known as
a.
linear accelerator
b.
betatron
c.
van de Graaff generator
d.
synchrotron
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Q24 mcq
Which material has high elastic limit?
a.
Rubber
b.
Aluminium
c.
Quartz
d.
Copper
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Q25 mcq
Dimension of stress is
a.
$MLT^{-2}$
b.
$ML^{-2}T^{-2}$
c.
$ML^{-1}T^{-1}$
d.
$ML^{-1}T^{-2}$
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Q26 mcq
When $n_1 = 1.48$, $n_2 = 1.46$, what is the value of numerical aperture?
a.
0.24
b.
0.10
c.
0.85
d.
0.90
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Q27 mcq
Which type of defect is electronic defect?
a.
Line defect
b.
Surface defect
c.
Point defect
d.
Volume defect
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Q28 mcq
............... is used as a relaxation oscillator.
a.
UJT
b.
FET
c.
PNP transistor
d.
NPN transistor
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Q29 mcq
If 1 kg of substance is fully converted into energy, how much energy is released?
a.
$9 \times 10^{16}$ joules
b.
$3 \times 10^{16}$ joules
c.
$9 \times 10^8$ joules
d.
$0.9 \times 10^{16}$ joules
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Q30 mcq
Geiger-Nuttal law is
a.
$R = \alpha Y^3$
b.
$\log \lambda = A + B \log R$
c.
$\sqrt{\nu} = a(z-b)$
d.
$\lambda = \dfrac{hc}{eV}$
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Q31 mcq
Zinc plate will emit photoelectrons when which of the lights falls on it?
a.
Visible
b.
Infrared
c.
Ultraviolet
d.
Laser
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Q32 mcq
In hydrogen atom $H_{\alpha}$ line is due to the transition of electron from the state $n$ of which the value is three to which value of $n$?
a.
1
b.
2
c.
4
d.
5
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Q33 mcq
The refractive index of the core of an optical fibre is higher than that of cladding because of
a.
better confinement of light
b.
maximum distance operation
c.
easy to handle
d.
higher life time of the material
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Q34 mcq
What is half the angular width of the principal maximum when the number of lines on the grating surface is large?
a.
Zero
b.
Small
c.
Large
d.
Equal to the number of lines
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Q35 mcq
What is the change in entropy when 10 gram of ice at $0^\circ$C is converted into water at the same temperature? $\,(L = 80\,\text{cal/g})$
a.
0.03 cal/K
b.
2.93 cal/K
c.
0.29 cal/K
d.
0 cal/K
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Q36 mcq
Heat engines convert heat energy into
a.
mechanical energy
b.
electrical energy
c.
chemical energy
d.
light energy
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Q37 mcq
In superconducting state
a.
entropy increases and thermal conductivity decreases
b.
entropy and thermal conductivity decrease
c.
entropy and thermal conductivity increase
d.
entropy decreases and thermal conductivity increases.
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Q38 mcq
Which of the following is commonly used as local oscillator in radio receiver ?
a.
Cyclotron
b.
Betatron
c.
Hartley oscillator
d.
Synchrotron.
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Q39 mcq
What is the particle Y in the given nuclear reaction? $$\,_{4}^{9}\mathrm{Be} + \,_{2}^{4}\mathrm{He} \rightarrow \,_{6}^{12}\mathrm{C} + Y$$
a.
electron
b.
positron
c.
proton
d.
neutron.
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Q40 mcq
In a betatron, electron is accelerated by
a.
static magnetic field.
b.
static electric field
c.
changing electric field
d.
changing magnetic field.
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Q41 mcq
Which is used to produce velocity modulation in Klystron oscillator ?
a.
Transit time of the electron
b.
Width of the drift space
c.
Energy of the electron
d.
Electric field.
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Q42 mcq
What is the uncertainty in the momentum of the electron located in the diffraction of a beam of electrons ?
a.
$\Delta p = \frac{2h}{\lambda} \sin \theta$
b.
$\Delta p = \frac{h}{2\lambda} \sin \theta$
c.
$\Delta p = \frac{\lambda}{2h} \sin \theta$
d.
$\Delta p = \frac{2h}{\lambda \sin \theta}$
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Q43 mcq
At threshold frequency the K.E. of the photoelectron is
a.
maximum
b.
zero
c.
minimum
d.
unity.
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Q44 mcq
Sir C. V. Raman got Nobel prize for scattering of light in which year?
a.
1928
b.
1930
c.
1929
d.
1931.
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Q45 mcq
What is the transformer ratio in step-down transformer?
a.
$k = 0$
b.
$k = 1$
c.
$k < 1$
d.
$k > 1$
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Q46 mcq
For a magnetic substance what is the hysteresis loss per unit volume?
a.
$\frac{1}{4}\pi$ times the area of the $I-H$ loop
b.
4 times the area of the $I-H$ loop
c.
area of the $I-H$ loop
d.
2 times the area of the $I-H$ loop
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Q47 mcq
According to the theory of interference fringes, the fringe width $\beta$ is
a.
inversely proportional to $d$
b.
directly proportional to $n$
c.
inversely proportional to $\lambda$
d.
directly proportional to $d$
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Q48 mcq
The condition used in the optical instruments to calculate the resolving power is
a.
Fraunhofer's criterion
b.
Fresnel's criterion
c.
Rayleigh's criterion
d.
Thomson's criterion.
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Q49 mcq
The critical temperature in the van der Waals' equation is
a.
$T_c = \frac{8a}{27Rb}$
b.
$T_c = \frac{a}{27b^2}$
c.
$T_c = \frac{8b}{27Ra}$
d.
$T_c = \frac{27Rb}{8a}$
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Q50 mcq
If the spheres are perfectly elastic, the loss in K.E. due to direct impact between them is
a.
one
b.
$\frac{1}{2} I (u_1-u_2)(1-p^2)$
c.
$\frac{m_1m_2(u_1-u_2)^2}{2(m_1+m_2)}$
d.
zero.
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Q51 mcq
In class A amplifier the output remains in which region?
a.
Cut-off region
b.
Active region
c.
Saturation region
d.
Between cut-off and saturation regions.
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Q52 mcq
Application of reverse bias to a PN diode
a.
increases the potential barrier
b.
lowers the potential barrier
c.
decreases the majority carrier current
d.
decreases the minority carrier current.
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Q53 mcq
Fusion reactions can take place only at
a.
low temperature
b.
high temperature
c.
very high temperature
d.
medium temperature.
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Q54 mcq
A device that counts individual particles but cannot measure their energy is
a.
G. M. counter
b.
moving coil galvanometer
c.
spectrometer
d.
potentiometer
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Q55 mcq
In Raman effect $\gamma$ is the frequency of the incident radiation. $\gamma'$ is the frequency of the scattered radiation, then (i) $\gamma' = \gamma$ or $\lambda' = \lambda$ (ii) $\gamma' < \gamma$ or $\lambda' > \lambda$ (iii) $\gamma' > \gamma$ or $\lambda' < \lambda$ Using it find the correct answer from the following:
a.
(i) - a, (ii) - c, (iii) - b
b.
(i) - b, (ii) - c, (iii) - a
c.
(i) - a, (ii) - b, (iii) - c
d.
(i) - c, (ii) - b, (iii) - a
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Q56 mcq
Infrared spectra can be analysed using
a.
Cornu's prism spectroscope
b.
Optical fibre
c.
Wordsworth spectroscope
d.
Aston's mass spectroscope
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Q57 mcq
When three capacitors 2 $\mu$F, 3 $\mu$F and 6 $\mu$F are connected in parallel, what is their effective capacitance?
a.
11 $\mu$F
b.
8 $\mu$F
c.
3 $\mu$F
d.
1 $\mu$F
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Q58 mcq
What is the purpose of using high resistance in the potentiometer circuit?
a.
Reduce the internal resistance of the accumulator
b.
Increase the internal resistance of the accumulator
c.
Safeguard the galvanometer
d.
Safeguard the potentiometer
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Q59 mcq
What is the excess of pressure inside a soap bubble of radius $R$ and surface tension $\sigma$?
a.
$p = 4\sigma / R$
b.
$p = \sigma / R$
c.
$p = 2\sigma / R$
d.
$p = 4\sigma / R^2$
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Q60 mcq
If $\vec r$ is the position vector, what is $\mathrm{div}\,\vec r$?
a.
1
b.
4
c.
3
d.
9
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Q60 mcq
If $\mathbf{r}$ is the position vector, what is div $\mathbf{r}$?
a.
1
b.
4
c.
3
d.
9
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Q61 mcq
In a transistor $\alpha = 0.9$. What is the value of $\beta$?
a.
0.9
b.
1
c.
9
d.
90
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Q62 mcq
Which type of waves are used in Radar?
a.
Microwaves
b.
Radio waves
c.
Audio waves
d.
Ultrasonic waves
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Q63 mcq
Which type of defect may be called as dislocation?
a.
Surface defect
b.
Point defect
c.
Volume defect
d.
Line defect
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Q64 mcq
Type I superconductors belong to which type of magnetic material?
a.
Paramagnetic
b.
Diamagnetic
c.
Combination of para- and ferro-magnetic
d.
Ferromagnetic
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Q65 mcq
What is the energy equivalent of 1 a.m.u. in MeV?
a.
93.13 MeV
b.
9.313 MeV
c.
931.3 MeV
d.
0.9313 MeV
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Q66 mcq
The same radioactive nucleus may emit
a.
$\alpha$, $\beta$, $\gamma$ simultaneously
b.
only $\alpha$ and $\beta$ simultaneously
c.
either $\alpha$ or $\beta$ and $\gamma$ at a time
d.
$\alpha$, $\beta$ and $\gamma$ one after another
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Q67 mcq
Raman effect is similar to which effect?
a.
Tyndall effect
b.
Photoelectric effect
c.
Compton effect
d.
Polarisation effect
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Q68 mcq
Population inversion will be achieved when
a.
$\omega > \frac{1}{\tau_{10}}$
b.
$\omega = \frac{1}{\tau_{10}}$
c.
$\omega < \frac{1}{\tau_{10}}$
d.
$\omega > \tau_{10}$
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Q69 mcq
A quantum state is defined by a set of four quantum numbers $(n, l, m_l, m_s)$. For $1s^2$ state, the relevant quantum numbers are
a.
$1, 0, 0, \pm \frac{1}{2}$
b.
$1, 1, 0, \pm \frac{1}{2}$
c.
$1, 0, 1, \pm \frac{1}{2}$
d.
$1, 1, 1, \pm \frac{1}{2}$
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Q70 mcq
As the wavelength of X-rays is smaller than that of visible light, the velocity of X-rays in vacuum is
a.
greater than the velocity of light
b.
less than the velocity of light
c.
infinity
d.
same as the velocity of light
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Q71 mcq
When white light is incident on a thin film, the film will appear coloured. This is due to which effect?
a.
Diffraction
b.
Interference
c.
Reflection
d.
Total internal reflection
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Q72 mcq
What is the susceptibility of diamagnetic material?
a.
Low negative value
b.
High negative value
c.
High positive value
d.
Low positive value
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Q73 mcq
Compressibility of a body is
a.
reciprocal of bulk modulus
b.
reciprocal of modulus of rigidity
c.
product of bulk modulus and Young's modulus
d.
product of Young's modulus and rigidity modulus
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Q74 mcq
M.K.S. unit of surface tension is
a.
newton/m$^2$
b.
newton m$^{-2}$ sec$^{-2}$
c.
newton/m
d.
newton-m
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Q75 mcq
In simple harmonic motion
a.
potential energy is constant
b.
kinetic energy is constant
c.
amplitude is constant
d.
phase is constant
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Q76 mcq
At which temperature water has maximum specific heat?
a.
0°C
b.
100°C
c.
4°C
d.
50°C
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Q77 mcq
A person is hurt on kicking a stone due to
a.
reaction
b.
mass
c.
velocity
d.
momentum
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Q78 mcq
Which of the following harbours is not a natural harbour?
a.
Cochin
b.
Chennai
c.
Mumbai
d.
Paradwip
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Q79 mcq
Recently one Indian cricket player has become the sixth batsman to score 10,000 runs in Test Cricket. The name of the player is
a.
Sachin Tendulkar
b.
Virender Sehwag
c.
Sourav Ganguly
d.
Rahul Dravid
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Q80 mcq
The battle of Wandiwash was fought between
a.
Marathas and Portuguese
b.
the English and the French
c.
the English and Portuguese
d.
Marathas and the English
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Q81 mcq
Linear programming is designed by
a.
B. F. Skinner
b.
E. L. Thorndike
c.
L. P. Pavlov
d.
Clark L. Hull
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Q82 mcq
Which of the following first identified the Secondary Education as a weak link and suggested improvement?
a.
The Tarachand Committee (1948)
b.
The Secondary Education Commission (1954)
c.
The University Education Commission (1949)
d.
The Education Commission (1966)
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Q83 mcq
Intelligence test scores are reasonably stable after the age of
a.
one
b.
two
c.
five
d.
twenty
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Q84 mcq
Which one is not an S-R theory with reinforcement?
a.
E. L. Thorndike's theory
b.
Hull's theory
c.
B. F. Skinner's theory
d.
Tolman's theory of learning
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Q85 mcq
The emphasis of National Board for Adult Education on Curriculum is that it must be
a.
need-based
b.
functional
c.
job-oriented
d.
production-oriented.
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Q86 mcq
World First Aid Day is
a.
September 11
b.
September 12
c.
September 10
d.
September 9.
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Q87 mcq
For the following scores 10, 11, 13, 10, 15, 17, 18, 15, 10, the value of mode is
a.
10
b.
13
c.
15
d.
18.
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Q88 mcq
Educational Technology means
a.
Technology in Education
b.
Technology of Education
c.
both of these
d.
none of these.
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Q89 mcq
Which one of the following is not a cause for forgetting?
a.
When something learned and not used repeatedly
b.
Interference with present learning
c.
Lack of reorganisation of the learning material
d.
Learning on the basis of short-term remembrance.
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Q90 mcq
When the reason for acting is in the action, motivation is said to be
a.
extrinsic
b.
intrinsic
c.
extrinsic & intrinsic
d.
none of these.
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Q91 mcq
National Integration Day is
a.
November 19
b.
December 19
c.
September 19
d.
May 19.
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Q92 mcq
The importance of Teacher Education was first emphasized by
a.
the Woods Dispatch
b.
the Hunter Commission
c.
Calcutta University Commission
d.
the White Paper.
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Q93 mcq
Taxonomy of educational objectives was first developed by
a.
Mager
b.
Skinner
c.
Bloom
d.
Thorndike.
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Q94 mcq
SSA is established for achievement of
a.
Elementary Education
b.
Secondary Education
c.
Higher Education
d.
Vocational Education
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Q95 mcq
Whose philosophy is characterised as "Naturalistic in its setting, Idealistic in its aim and Pragmatic in its method and Programme of work"?
a.
Sri Aurobindo
b.
Gandhiji
c.
Rousseau
d.
Tagore
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Q96 mcq
Multi-factor theory of Intelligence was developed by
a.
Charles Spearman
b.
E. L. Thorndike
c.
L. L. Thurstone
d.
Dr. J. P. Guilford
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Q97 mcq
What are the primary colours used in colour TV?
a.
Red, Green and Blue
b.
Red, Blue and Yellow
c.
Blue, Green and Yellow
d.
Red, Yellow and Black
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Q98 mcq
If the output of an amplifier is 10 V and 100 mV is feedback from output to the input, then the feedback fraction is
a.
0.1
b.
0.01
c.
1
d.
10
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Q99 mcq
When the current is 1 ampere, what is the force per unit length between two parallel conductors?
a.
$4 \times 10^{-7}\,\text{N/m}$
b.
$4\pi \times 10^{-7}\,\text{N/m}$
c.
$2 \times 10^{-7}\,\text{N/m}$
d.
$2\pi \times 10^{-7}\,\text{N/m}$
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Q100 mcq
For a 4d state, the value of the orbital quantum number is
a.
1
b.
2
c.
3
d.
4
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Q101 mcq
What are the inputs of two input NAND gate at which the output is zero?
a.
A = 0, B = 0
b.
A = 0, B = 1
c.
A = 1, B = 1
d.
A = 1, B = 0
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Q102 mcq
Which properties are necessary to increase the temperature of a vessel?
a.
Low specific heat capacity and thermal conductivity
b.
High thermal conductivity and low specific heat capacity
c.
High specific heat capacity and low thermal conductivity
d.
High thermal conductivity and specific heat capacity
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Q103 mcq
In $\beta$-decay an uncharged particle of zero mass and spin $\tfrac{1}{2}$ is emitted with the electron which is
Question 104 image
a.
positron
b.
negatron
c.
antineutron
d.
neutrino
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Q104 mcq
During the formation of a bond
Question 105 image
a.
energy remains constant
b.
some energy is gained
c.
some energy is lost
d.
total mass decreases
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Q105 mcq
The colour of light transmitted by chromium atom in Ruby laser is
Question 106 image
a.
ultraviolet and green
b.
ultraviolet and yellow
c.
green and yellow
d.
red and blue
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Q106 mcq
The pressure of neon gas in the He-Ne laser is ............ of Hg.
Question 107 image
a.
0.1 mm
b.
0.01 mm
c.
1 mm
d.
0.001 mm
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Q107 mcq
The electrical intensity at a point due to a charge of strength $q$ coulomb at a distance $r$ is
Question 108 image
a.
$\dfrac{q}{4\pi\varepsilon_0\varepsilon_r r}$ N/C
b.
$\dfrac{q^2}{4\pi\varepsilon_0\varepsilon_r r^2}$ N/C
c.
$\dfrac{q^2}{4\pi\varepsilon_0\varepsilon_r r}$ N/C
d.
$\dfrac{q}{4\pi\varepsilon_0\varepsilon_r r^2}$ N/C
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Q108 mcq
In a ballistic galvanometer, the suspension fibre vibrates in the magnetic field for a longer time because of
Question 109 image
a.
M.I. of the suspension fibre is small
b.
resistance of the suspension fibre
c.
friction of air
d.
M.I. of the suspension fibre is large
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Q109 mcq
Impulse has the same unit as
Question 110 image
a.
work
b.
angular momentum
c.
linear momentum
d.
force
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Q110 mcq
Coefficient of viscosity of water is
Question 111 image
a.
0.01 N.s.m^-2
b.
0.001 N.s.m^-2
c.
0.0001 N.s.m^-2
d.
0.00001 N.s.m^-2
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Q111 mcq
N-type semiconductor as a whole is
Question 112 image
a.
electrically neutral
b.
negatively charged
c.
positively charged
d.
more positive charge and less negative charge
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Q112 mcq
What is the ripple factor of a full-wave rectifier?
Question 113 image
a.
1.21
b.
0.8
c.
0.48
d.
2
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Q113 mcq
The critical magnetic field of a superconductor can be represented by
Question 114 image
a.
$H_c = H_0\left(1 - \dfrac{T^2}{T_c^2}\right)$
b.
$H_c = H_0\left(1 - \dfrac{T_c^2}{T^2}\right)$
c.
$H_c = H_0\left(\dfrac{T^2}{T_c^2} - 1\right)$
d.
$H_c = H_0\left(\dfrac{T_c^2}{T^2} - 1\right)$
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Q114 mcq
When the bond length is decreased, the bond energy
Question 115 image
a.
remains constant
b.
increases
c.
decreases
d.
may increase or decrease
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Q115 mcq
In Newtonian mechanics, the motion of the bodies travelling at velocities $v$ is
a.
equal to that of light
b.
greater than the velocity of light
c.
less than the velocity of light
d.
very much less than the velocity of light
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Q116 mcq
What is the function of carbon-12 in carbon-nitrogen cycle?
a.
Auto-catalyst
b.
Catalyst
c.
Auto-oxidant
d.
Oxidant
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Q117 mcq
It is the interference pattern formed when scattered radiation from a material and the reference radiation interfere with each other. What is it?
a.
Photographic plate
b.
Gramophone record
c.
Hologram
d.
Compact disk
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Q118 mcq
What happens to the mass of the electron as its velocity approaches the velocity of light?
a.
0
b.
1
c.
2
d.
$\infty$
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Q119 mcq
Elliptical orbit for an electron was proposed by
a.
Niels Bohr
b.
Rutherford
c.
Pauli
d.
Sommerfeld
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Q120 mcq
Which type of cells does not require external battery to operate?
a.
Photoemissive cell
b.
Photoconductive cell
c.
Photovoltaic cell
d.
Simple voltaic cell
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Q121 mcq
In which Indian city was fibre optic system introduced first?
a.
Delhi
b.
Pune
c.
Mumbai
d.
Chennai
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Q122 mcq
Antimony and Bismuth are preferred in a thermocouple. Why?
a.
Thermo e.m.f. is $∞$
b.
Thermo e.m.f. is small
c.
Thermoelectric current is large
d.
Thermo e.m.f. is large
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Q123 mcq
For a given material, if the Young's modulus is 2.4 times its rigidity modulus, what is its Poisson's ratio?
a.
1.2
b.
0.2
c.
0.4
d.
0
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Q124 mcq
Which one of the following vector relations is correct?
a.
$\nabla \cdot (fA)=f(\nabla \cdot A)+A\cdot\nabla f$
b.
$\nabla \cdot (\nabla \times A)=\text{Curl grad. } f$
c.
$\nabla \times \nabla \times A=\nabla^2(\nabla \cdot A)-\nabla\cdot A$
d.
$\nabla \times fA=f(\nabla \cdot A)-A\times\nabla f$
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Q125 mcq
In SHM equation $y=6\sin(2\pi t+\pi/3)$, what is the period of oscillation?
a.
4 sec
b.
5 sec
c.
2.5 sec
d.
1 sec
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Q126 mcq
A Carnot engine operates between 627°C and 27°C. Its efficiency is
a.
90%
b.
60%
c.
66.6%
d.
50%
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Q127 mcq
What type of force is in between molecules of a polymer?
a.
Gravitational force
b.
Viscous force
c.
Molecular force
d.
Force of attraction
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Q128 mcq
The hardness of pure ceramic oxide can be increased by adding which elements?
a.
Carbide and Chromium
b.
Carbide and Nitride
c.
Nitride and Chloride
d.
Nitride and Acetate
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Q129 mcq
This is related to a particle in motion. This must be well behaved, that is single valued, finite and continuous everywhere. This is
a.
energy
b.
momentum
c.
velocity
d.
wave function
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Q130 mcq
According to special theory of relativity, space and time have
a.
absolute meaning
b.
relative meaning
c.
selective meaning
d.
vague meaning
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Q131 mcq
The value of Lande's splitting factor $g_l$ for an s-electron is
a.
0
b.
1
c.
$\frac{1}{2}$
d.
2
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Q132 mcq
How many types of Bravais lattices are possible?
a.
12
b.
14
c.
16
d.
18
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Q133 mcq
In a Newton's ring experiment the diameter of 5th ring changes from 1.8 cm to 1.2 cm when a liquid is introduced between the lens and the plate. What is the $\mu$ of the liquid?
a.
1.5
b.
2.25
c.
2.8
d.
3.0
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Q134 mcq
The magnifying power of a telescope depends on
a.
wavelength of the light
b.
diameter of the lens
c.
refractive index of the lens
d.
focal length of the lens
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Q135 mcq
In damped harmonic oscillations, the amplitude of oscillations
a.
gradually decreases
b.
gradually increases
c.
remains constant
d.
becomes infinity
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Q136 mcq
Ultrasonic waves can be generated by
a.
Piezoelectric effect
b.
Doppler effect
c.
Kerr effect
d.
Thomson effect
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Q137 mcq
Cobalt is used in the preparation of
a.
ceramic material
b.
thermoelectric material
c.
cermet material
d.
optical material
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Q138 mcq
Zener diode is used as
a.
voltage regulator
b.
rectifier
c.
amplifier
d.
oscillator
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Q139 mcq
The empirical formula for the nuclear radius is
a.
$R = r_0 A^{-2/3}$
b.
$R = r_0 A^{-1/3}$
c.
$R = r_0 A^{2/3}$
d.
$R = r_0 A^{1/3}$
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Q140 mcq
In the following reactions which one is possible?
a.
$\Lambda^0 \rightarrow \pi^+ + p$
b.
$p + p \rightarrow n + p + \pi^+$
c.
$e^+ + e^+ \rightarrow \mu^+ + \mu^-$
d.
$p + p \rightarrow p + \Sigma^+$
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Q141 mcq
Which condition is to be satisfied by a normalized wave function?
a.
$\int_a^b \psi_2^*(x)\psi_1(x)\,dx = 0$
b.
$\int \psi\psi^*\,dx\,dy\,dz = 1$
c.
$\int_a^b \psi_2^*(x)\psi_1(x)\,dx = 1$
d.
$\int \psi\psi^*\,dx\,dy\,dz = 0$
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Q142 short answer
A rod 1 m long is moving with a velocity 0.6 c. Its length as it appears to a stationary observer is
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Q143 mcq
The weight of deuterium is
a.
thrice that of hydrogen
b.
twice that of hydrogen
c.
equal to that of hydrogen
d.
four times that of hydrogen
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Q144 mcq
The frequency of the microwave generated by the magnetron oscillator depends on
a.
breadth of the resonant cavities
b.
thickness of the resonant cavities
c.
frequency of RF oscillation existing in the resonant cavities
d.
magnetic field
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Q145 mcq
The potential at a point due to a charge of 100 micro-coulomb at a distance of 9 m is
a.
$10^4$ volts
b.
$10^9$ volts
c.
$10^7$ volts
d.
$10^5$ volts
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Q146 mcq
What is the current sensitivity of a moving coil galvanometer?
a.
$\dfrac{T}{2\pi}\cdot \dfrac{C}{nAB}$
b.
$\dfrac{I\,nAB}{C}$
c.
$\dfrac{C}{nAB}$
d.
$\dfrac{nAB}{C}$
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Q147 mcq
The flexible optical fibre bundles are used in medical instrumentation. What is its name?
a.
Stethoscope
b.
Endoscope
c.
Oscilloscope
d.
Kaleidoscope
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Q148 mcq
What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 Å by means of a diffraction grating with 5000 lines/cm when adjusted for normal incidence?
a.
3
b.
2
c.
5
d.
4
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Q149 mcq
The rate of loss of heat of a body depends upon
a.
mass of the body
b.
temperature difference between the body and surroundings
c.
colour of the body
d.
specific heat capacity
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Q150 mcq
For a perfectly elastic collision the coefficient of restitution is
a.
less than one
b.
equal to zero
c.
more than one
d.
equal to one
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