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
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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.
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.
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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.
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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
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