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Question 14 Marks

Elastic potential energy is Potential energy stored as a result of the deformation of an elastic object, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched

1. If stretch in spring of force constant k is doubled, then the ratio of final to initial forces is:
(a) $4: 1$ (b) $1: 4$ (c) $2: 1$ (d) $1: 2$
2.A light body and a heavy body have the same kinetic energy. which one has greater linear momentum?
(a) light body (b) both heavy and light body (c) Low body (d) heavy body
3. A spring is cut into two equal halves. How is the spring constant of each half affected?
(a) becomes double
(b) becomes triple
(c) becomes $1 / 4$ th
(d) becomes half
OR
When spring is compressed, its potential energy:
(a) fall (b) decrease (c) first increase then decrease (d) increase
4. What type of energy is stored in the spring of a watch?
(a) potential energy
(b) Electrical energy
(c) mechanical energy
(d) kinetic energy

Answer

1. (c) $2: 1$
Explanation: 2:1
2.(d) heavy body
Explanation: heavy body
3. (a) becomes double
Explanation: becomes double
OR
(d) increase
Explanation: increase
4. (a) potential energy
Explanation: potential energy

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Question 24 Marks

In a gas the particles are always in a state of random motion, all the particles move at different speed constantly colliding and changing their speed and direction, as speed increases it will result in an increase in its kinetic energy.

1. If the temperature of the gas increases from 300 K to 600 K then the average kinetic energy becomes:
(a) same (b) becomes double (c) becomes half (d) become triple
2. What is the average velocity of the molecules of an ideal gas?
(a) Infinite (b) Same (c) Increase (d) Zero
3. Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will ___________.
(a) decrease (b) Rises (c) increase (d) remains same
4. Find the ratio of average kinetic energy per molecule of Oxygen and Hydrogen:
(a) $1: 1$ (b) $4: 1$ (c) $1: 2$ (d) $1: 4$
OR
The velocities of the three molecules are $3 v , 4 v$, and 5 v . calculate their root mean square velocity?
(a) 4.0 v (b) 4.02 v (c) 4.08 v (d) 4.04 v

Answer

1. (b) becomes double
Explanation: becomes double
2. (d) Zero
Explanation: Zero
3. (d) remains same
Explanation: remains same
4. (a) $1: 1$
Explanation: 1:1
OR
(c) 4.08 v
Explanation: 4.08 v

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Physics 4 Marks Question

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