Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens ?
a.
f
b.
infinity
c.
2f
Correct Answer
d.
between f and 2f
Step-by-Step AI Explanation
Verified Method
A convex lens forms a real and inverted image of the same size as the object when the object is placed at $2f$ (twice the focal length). In this case, the image is also formed at $2f$ on the other side of the lens. At $f$ the image is formed at infinity, at infinity the image is at the focus and highly diminished, and between $f$ and $2f$ the image is real, inverted and enlarged.
Q2mcq1 mark
If a molecule is made of similar kind of atoms, then it is called __________ molecule.
a.
Mono atomic
b.
hetero atomic
c.
homo atomic
Correct Answer
d.
poly atomic
Step-by-Step AI Explanation
Verified Method
A molecule made of similar kind of atoms is called a homo atomic molecule. "Homo" means same, so the atoms present are of the same element. Monoatomic means a single atom, hetero atomic means different kinds of atoms, and polyatomic refers to a molecule with many atoms, not necessarily of the same kind.
Q3mcq1 mark
The number of components in a binary solution is _________.
a.
2
Correct Answer
b.
3
c.
4
d.
5
Step-by-Step AI Explanation
Verified Method
A binary solution has $2$ components. 'Binary' means two, so the solution contains two substances: a solute and a solvent.
Q4mcq1 mark
A charge of 12 coulomb flows through a bulb in 5 sec ond. What is the current through the bulb ?
a.
60 A
b.
17 A
c.
2.4 A
Correct Answer
d.
24 A
Step-by-Step AI Explanation
Verified Method
Current is given by $I=\frac{Q}{t}$. Here, $Q=12\,\text{C}$ and $t=5\,\text{s}$. So, $I=\frac{12}{5}=2.4\,\text{A}$. Therefore, the current through the bulb is $2.4\,\text{A}$.
Q5mcq1 mark
Rectified spirit is an aqueous solution which contains about __________ of ethanol.
a.
95.5%
Correct Answer
b.
75.5%
c.
55.5%
d.
45.5%
Step-by-Step AI Explanation
Verified Method
Rectified spirit is an aqueous solution containing about $95.5\%$ ethanol. It is ethanol with a small amount of water left after rectification.
Q6mcq1 mark
The endarch condition is the characteristic feature of __________.
a.
root
b.
stem
Correct Answer
c.
leaves
d.
flowers
Step-by-Step AI Explanation
Verified Method
Endarch condition is a characteristic feature of the stem. In endarch xylem, protoxylem lies towards the centre and metaxylem towards the periphery. This arrangement is typical of stems, whereas roots usually show exarch condition.
Q7mcq1 mark
The heart of fishes possess __________ chambers.
a.
3
b.
4
c.
2
Correct Answer
d.
5
Step-by-Step AI Explanation
Verified Method
The heart of fishes has $2$ chambers: one atrium and one ventricle. Hence, the correct answer is $2$ chambers.
Q8mcq1 mark
Male gametes in angiosperms are formed by the division of __________.
a.
Generative cell
Correct Answer
b.
Vegetative cell
c.
Pollen grain mother cell
d.
Microspore
Step-by-Step AI Explanation
Verified Method
Male gametes in angiosperms are formed by the division of the generative cell. The generative cell divides mitotically to produce two male gametes (sperm cells). The vegetative cell does not form gametes; it helps in pollen tube growth.
Q9mcq1 mark
Which one is referred as “Master Gland” ?
a.
Pineal gland
b.
Pituitary gland
Correct Answer
c.
Thyroid gland
d.
Adrenal gland
Step-by-Step AI Explanation
Verified Method
Pituitary gland is called the “Master Gland” because it secretes hormones that control the activity of many other endocrine glands. Pineal, thyroid and adrenal glands are not called the master gland.
Q10short answer
(a) (i) What is meant by electric current ?
(ii) Name and define its unit.
(iii) Which instrument is used to measure the electric current ? How should it be connected in a circuit ?
Step-by-Step AI Explanation
Verified Method
(i) Electric current is the rate of flow of electric charge through a conductor.
(ii) The SI unit of electric current is ampere (A). One ampere is the current flowing when one coulomb of charge passes through a point in a conductor in one second. That is, $1\,\text{A} = 1\,\text{C s}^{-1}$.
(iii) Electric current is measured by an ammeter. It should be connected in series in the circuit so that the same current flows through the ammeter and the circuit.
🎉 10 Free Sample Solutions Completed
Unlock All 47 Questions & Solutions
Sign up free in seconds to unlock step-by-step AI answers for the remaining 37 questions.
(b) (i) Who discovered natural radioactivity ?
(ii) Write any three features of natural and artificial radioactivity.
(iii) Give any three uses of radio isotopes in the field of agriculture.
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
Match the following :
(1)Solar Energy (i)Flowing water
(2)Petroleum (ii)Mobile phone
(3)Hydropower (iii)Inexhaustible energy
(4)Electronic device (iv)Exhaustible energy resource
a.
(1) - (iv), (2) - (iii), (3) - (ii), (4) - (i)
b.
(1) - (iii), (2) - (iv), (3) - (i), (4) - (ii)
c.
(1) - (iii), (2) - (i), (3) - (iv), (4) - (ii)
d.
(1) - (i), (2) - (iv), (3) - (ii), (4) - (iii)
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
Write the functional group and the suffix used for the following class of compounds.
Class of Compounds Functional Group Suffix used
Alcohol
Aldehyde
Ketone
Carboxylic Acid
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
A person with myopia can see objects placed at a distance of 4 m. If he wants to see objects at a distance of 20 m, what should be the focal length and power of the concave lens he must wear ?
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
Classify the following compounds based on the pattern of carbon chain and give their structural formula :
(i)Propane (ii)Benzene (iii)Cyclobutane (iv)Furan
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
‘A’ is a blue coloured crystalline salt. On heating it loses blue colour and gives ‘B’. When water is added, ‘B’ gives back ‘A’. Identify ‘A’ and ‘B’. Write the equation.
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
(a)(i)What is meant by electric current ?
(ii)Name and define its unit.
(iii)Which instrument is used to measure the electric current ? How should it be connected in a circuit ?
OR
(b)(i)Who discovered natural radioactivity ?
(ii)Write any three features of natural and artificial radioactivity.
(iii)Give any three uses of radio isotopes in the field of agriculture.
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
(a)(i)Define :Atomicity. Give an example.
(ii)Consolidate the major differences between atoms and molecules.
OR
(b)(i)Define combination reaction.
(ii)Give an example for combi
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
