Sample question paper

Which of the following statement is true for the radio waves and the gamma rays?

1. AThe energy of gamma rays is lesser than that of the radio waves.
2. BThe frequency of the radio waves is higher than that of gamma rays.
3. CThe radio waves and the gamma rays have the same energy.
4. DThe energy of radio waves is lesser than that of the gamma rays.

A charged particle is projected along the axis of a current carrying loop. Which of the following statements is true?

1. AThe acceleration of the charged particle will depend on the velocity with which it is projected.
2. BThe acceleration of the charged particle will depend on the magnitude of the current passing through the coil.
3. CThe acceleration of the charged particle will depend on the radius of the coil.
4. DThe charged particle will move with constant velocity.

Two small identical magnets are allowed to fall freely one through a vertical solenoid of 20 m made up of copper and another in air through the same vertical distance. The time taken by the two magnets to fall will be

1. Asame in both the cases.
2. Bmore for the magnet falling in air.
3. Cmore for the magnet falling through the solenoid.
4. Dinfinite.

The emf generated by an AC generator is given by V=Vo sin ωt, where ω is angular frequency of armature of generator. What will be the emf if the angular frequency is doubled

1. AV=Vo sin 2ωt
2. BV=2Vo sin ωt
3. CV=2Vo sin 2ωt
4. DV=Vo sin ωt

The ratio of the nuclear densities of two nuclei having the mass numbers 8 and 27 is

1. A8:27
2. B3:2
3. C2:3
4. D1:1

Assertion (A): Total energy of an electron in hydrogen atom is negative. Reason (R): The centripetal force is provided by electrostatic force.

1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. CAssertion is true but Reason is false.
4. DBoth Assertion and Reason are false.