General Knowledge Question Answer: Physics GK Questions and Answers

General Knowledge Physics Questions, Physics Quiz for Competitive Exams, Important Physics MCQs for GK

Q. A diode can be used to -
1) Amplify electrical signal
2) Convert alternating current to direct current
3) Produce electrical signal
4) Produce gamma rays

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Q. What is the momentum of an object of mass m, moving with a velocity v?
1) (mv)2
2) mv2
3) 1/2 mv2
4) mv

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Q. The audible range of hearing for average human beings is in the frequency range of -
1) 10 Hz - 15 kHz
2) 20 Hz - 20 kHz
3) 30 Hz - 30 kHz
4) 40 Hz - 40 kHz

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Q. Which one among the following is the correct focal length of a combination of lenses of power 2.5 D and -2.0 D?
1) +0.5 m
2) -0.5 m
3) +2.0 m
4) -2.0 m

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Q. The elemental composition of diamond is -
1) Carbon and Hydrogen
2) Carbon and Oxygen
3) Pure Carbon
4) Pure Silicon

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Q. At which temperature does liquid water show maximum density?
1) 299 K
2) 277 K
3) 285 K
4) 373 K

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Q. Given below are the four cases in which certain heat transfer is taking place:
1. Ice is melting in a glass full of water
2. Water is boiling in an open container
3. A metal rod is heated in a furnace
4. A cup of coffee is allowed to cool on a table
In which of the above cases the Newton's Law of Cooling applicable?

1) Only 1
2) Only 4
3) Only 1 and 4
4) 1, 2, and 3

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Q. A block of mass 2.0 kg slides on a rough horizontal plane surface. Let the speed of the block at a particular instant be 10 m/s. It comes to rest after travelling a distance of 20 m. Which one of the following could be the magnitude of the frictional force?
1) 10 N
2) 20 N
3) 40 N
4) 50 N

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Q. There is a ball of mass 320 g. It has 625 J of potential energy when released freely from a height. The speed with which it will hit the ground is -
1) 62.5 m/s
2) 2.0 m/s
3) 50 m/s
4) 40 m/s

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Q. A car weighs 1000 kg. It is moving with a uniform velocity of 72 km/h towards a straight road. The driver suddenly presses the brakes. The car stops in 0.2s. The retarding force applied on the car to stop it is -
1) 100 N
2) 1000 N
3) 10 kN
4) 100 kN

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