21. Energy in the form of heat is wasted when a machine is operated. This heat is generated due to ___________.

1. Burning
2. Friction
3. Combustion
4. Lubrication

Option “2” is correct.
Energy in the form of heat is wasted when a machine is operated. This heat is generated due to Friction between two parts.
22. The incident ray, the _________ at the point of incidence and the reflected ray all lie in the same plane.

1. Surface
2. Tangent
3. Normal
4. Angle of reflection

Option “3” is correct.
The law of reflection states that the incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.
23. Seismometer was invented by –

1. Alexander Parkes
2. Luigi Palmieri
3. Alexey Pajitnov
4. Ransom Eli Olds

Option “2” is correct.
A Seismometer is an instrument that measures motion of the ground, caused by, for example, an earthquake, a volcanic eruption, or the use of explosives. It was invented by Italian scientist Luigi Palmieri.
24. For every action, there is an equal and opposite reaction, is Newton’s-

1. First law
2. Second law
3. Third law
4. Fourth law

Option “3” is correct.
Newton third law states that for every action there is an equal and opposite reaction.
25. Which among the following is false about displacement?

1. It can be positive, negative or zero
2. Displacement is never greater than Distance
3. Its SI unit is meter
4. It is always positive

Option “4” is correct.
A Displacement is a vector whose length is the shortest distance from the initial to the final position of a point P. It quantifies both the distance and direction of an imaginary motion along a straight line from the initial position to the final position of the point.
26. Pure water freezes at what temperature?

1. 47 F
2. 32 F
3. 0 F
4. 19 F

Option “2” is correct.
Water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin.
27. CT Scan is done by using-

1. Infra-red Rays
2. Ultrasonic Waves
3. Visible Light
4. X-Rays

Option “4” is correct.
CT scan or computed tomography are special x-rays tests that produce cross-sectional images of the body using x-rays and a computer.
28. If a person sitting in a lift then when will he feel that his weight gets increased?

1. When the elevator going upward expeditiously
2. When the elevator going down expeditiously.
3. Going upward with constant velocity.
4. Going downward with constant velocity.

Option “1” is correct.
It is clear that when the elevator is going upwards a person actually feels a little heavier than his usual weight and on the other hand when elevator accelerates downward then a person feels a little reduction than his usual weight.
29. The separation of cream from milk by churning is due to-

1. Gravitational force
2. Cohesive force
3. Centrifugal force
4. None of the above

Option “3” is correct.
The separation of cream from milk by churning is due to centrifugal force.
30. The speed of light is–

1. 9*10² m/sec
2. 3*10¹¹ m/sec
3. 3*10⁸ m/sec
4. 2*10⁴ m/sec

Option “3” is correct.
The speed of light in a vacuum is 3*10⁸ m/sec while the speed of sound in vacuum is zero and in air is 343 m/sec.
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