331. Energy conservation means-

1. Generation and destruction of energy
2. Energy could be created
3. Energy could not be created but destroyed
4. Energy can neither be created nor destroyed

Option “4” is correct.
Law of Conservation of Energy means Energy can neither be created nor be destroyed, rather it can only be transformed from one form to another.
332. When light passes from one medium to another, this phenomenon of change in its direction is called _____.

1. Refraction
2. Diffraction
3. Propagation
4. No option is correct

Option “1” is correct.
Refraction is the bending of light as it passes from one medium to another. The bending is caused by the differences in density between the two substances.
333. Who invented world’s first true radar and demonstrated its use?

1. Fred Morrison
2. A. H. Taylor and Leo C. Young
3. Van Tassel
4. W. K. Roentgen

Option “2” is correct.
A H Taylor and Leo C Young are inventor of first true radar.
334. When we see an object, the image formed on the retina is ________.

1. Real and inverted
2. Real and erect
3. Virtual and erect
4. Virtual and inverted

Option “1” is correct.
When we see an object, the image formed on the retina is real and inverted.
335. Kinetic energy depends on-

1. the velocity or speed of the moving body
2. the mass of the moving body
3. the pressure of the moving body
4. both mass and velocity of the moving body

Option “4” is correct.
The amount of translational kinetic energy that an object has depends upon two variables: the mass (m) of the object and the speed (v) of the object.
336. In which form is the supplied heat energy stored during change in temperature of substance?

1. Heat energy
2. Kinetic energy
3. Potential energy
4. Both kinetic and potential energy

Option “4” is correct.
Kinetic Energy is form of energy which is the supplied heat energy stored during change in temperature of substance.
337. A galvanometer can be converted into a voltmeter by connecting with it a –

1. High resistance in parallel
2. Low resistance in parallel
3. High resistance in series
4. Low resistance in series

Option “3” is correct.
In order to convert a Galvanometer into voltmeter, a very high resistance known as “series resistance” is connected in series with the galvanometer.
338. Even after sunset, the air near the Earth’s surface continues to receive heat due to:

1. Insolation
2. Terrestrial Radiation
3. Conduction
4. Convection

Option “2” is correct.
Even after sunset, the air near the Earth’s surface continues to receive heat due to Terrestrial Radiation.
339. Assertion (A) : kinematic viscosity of all liquids increases as temperature of liquids increases
Reason (R) : Rise of temperature increases kinetic energy of molecules.Code:1. Both (A) and (R) are true, and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Option “4” is correct.
It is observed that kinematic viscosity of all liquids decreases as temperature of liquids increases and vice versa. This is due to temperature rise of molecules of which causes decrease in cohesive forces of the molecules. The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more movable.
340. Food gets cooked faster in a pressure cooker because-

1. Water starts boiling at a lower temperature due to high pressure
2. Water starts boiling at a higher temperature due to high pressure
3. Water boils only at 100° C but the heat content is higher at high pressure
4. Convection currents are set inside the cooker

Option “2” is correct.
Food can be cooked faster in a pressure cooker since the boiling point of water increases with pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature.
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