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
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
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
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
Q. The elemental composition of diamond is -
1) Carbon and Hydrogen
2) Carbon and Oxygen
3) Pure Carbon
4) Pure Silicon
Q. At which temperature does liquid water show maximum density?
1) 299 K
2) 277 K
3) 285 K
4) 373 K
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
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
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
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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