Identify the 'WRONG' statement regarding electrostatics of conductors.
a.
Electric field inside a charged conductor is zero
b.
There is no excess charge inside a charged conductor
c.
Electric potential is constant throughout the volume of a conductor
d.
Electric field is tangential at all points on the surface of a charged conductor
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Q3mcq1 mark
The magnitude of drift velocity per unit electric field is called ______
a.
mobility
b.
current density
c.
resistivity
d.
conductivity
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Q4mcq1 mark
Statement I: A galvanometer is converted into an ammeter by connecting a resistor of low resistance in parallel with it.
Statement II: The voltage sensitivity of a galvanometer depends on number of turns of the coil.
Pick the correct answer:
a.
Both statements I and II are correct
b.
Both statements I and II are wrong
c.
Only statement I is correct
d.
Only statement II is correct
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Q5mcq1 mark
A small compass needle of magnetic dipole moment 'm' is placed in uniform magnetic field 'B' at an angle $\theta$, then the magnetic potential energy of the needle is
a.
+mB sin$\theta$
b.
-mB sin$\theta$
c.
+mB cos$\theta$
d.
-mB cos$\theta$
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Q6mcq1 mark
The Polarity of induced emf is given by
a.
Faraday's law
b.
Lenz's law
c.
Gauss's law in magnetostatics
d.
Ampere's circuital law
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Q7mcq
A rectangular loop is moving out of a uniform magnetic field region to a field – free region with constant velocity V. Here the magnetic field direction is perpendicular to the plane of the loop. Then, in the coil
a.
No emf is induced
b.
No current is induced
c.
Constant emf is induced
d.
Varying emf is induced
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Q7mcq1 mark
A rectangular loop is moving out of a uniform magnetic field region to a field-free region with constant velocity $\vec{V}$ as shown in figure. Then, in the coil
a.
No emf is induced
b.
No current is induced
c.
Constant emf is induced
d.
Varying emf is induced
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Q7mcq5 marks
A rectangular loop moves with a velocity $\vec{v}$ from a region of uniform magnetic field to a field-free region. The magnetic field is perpendicular to the plane of the loop. Then, in the loop
a.
Kinetic energy is induced.
b.
Electric current is induced.
c.
Electric potential is induced.
d.
Changing electric kinetic energy is induced.
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Q8mcq1 mark
In purely inductive ac circuit, the power factor is
a.
+1
b.
–1
c.
0
d.
$\infty$
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If Planck's constant and basic unit of electric charge are 'h' and 'e' respectively, then in photoelectric effect, the graph between stopping potential ($V_0$) and frequency ($\nu$) is a straight line with slope equal to _______.
a.
h/e
b.
e/h
c.
e
d.
h
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The List – I and List – II respectively represent materials and energy band gap $E_g$. Identify the correct match.
List – I | List – II
(i) Conductors | (p) $E_g > 3eV$
(ii) Insulators | (q) $E_g < 3eV$
(iii) Semiconductors | (r) $E_g = 0$
a.
(i) – (q); (ii) – (r); (iii) – (p)
b.
(i) – (r); (ii) – (p); (iii) – (q)
c.
(i) – (p); (ii) – (r); (iii) – (q)
d.
(i) – (r); (ii) – (q); (iii) – (p)
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A square coil of side 10 cm, 50 turns, carrying a current of 10A is placed in uniform magnetic field of 0.80 T in such a way that, the normal drawn to the plane of the coil makes an angle 30° with the direction of magnetic field. Find the magnitude of torque experienced by the coil.
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Using Huygen's principle, show that the angle of incidence is equal to the angle of reflection, when a plane wavefront is reflected by a plane surface.
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Two-point charges 2µC and 3µC are placed at the two corners A and B of an equilateral triangle ABC of side 0.2 m. Calculate the magnitude of resultant electric field at the corner C of that triangle.
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Two identical cells either connected in series or in parallel combination give the same value of current 0.5A through an external resistor of resistance 2Ω. Find the emf and internal resistance of each cell.
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A resistor of 100 Ω, an inductor of 200 mH and a capacitor of 100 µF are connected in series to a 220V, 50 Hz ac source. Calculate (i) impedance and (ii) current in the circuit.
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The angle of minimum deviation produced in a glass prism is 40°. Calculate the refractive index of the material of the prism, if the refracting angle of prism is 60°. Also calculate the new angle of minimum deviation when the prism is immersed in water of refractive index 1.33.
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