# Take a MCQ Test and Check Your Score. Set 1

Take a MCQ test before you appear for your next board examination and find out how much you score .

1. The radius of curvature of a plane mirror is
(a) zero b) infinite (c) +5 cm (d) -5 cm

2. The specific charge of electron is
(a) C/Kg (b) C/Kg (c) C/Kg (d) None

3. Two lens of power 15D and 5D are placed in contact co-axially. The focal length of equivalent lens is
(a) -10 cm (b) 20 cm (c) +10 cm (d) None

4. A cell of e.m.f. 1.5V is connected with an ammeter of resistance 0.05 . If the current in the circuit is 2.0 A, the internal resistance of the cell is :
(a) 1 .0 (b) 0.9 (c) 0.8 (d) 0.7 5. The phase difference between electric and magnetic fields in an electromagnetic wave is:
(a) zero (b) (c) (d) None of them

6. Killowatt hour (KWh) is an unit of:
(a) Energy (b) Power (c) Torque (d) Force

7. Work done in rotating an electric dipole in an electric field is
(a) ME(1- Cos( )) (b) ME tan( ) (c) ME sec( ) (d) None

8. Velocity of sound in air medium is
(a) 330 m/s (b) 3300 m/s (C) 33 m/s (d) None of these

9. If two conducting spheres are connected after charging separately then-
(a) both sphere energy will remain conserved (b) both charge remain conserved
(c) both energy and charge remain conserved (d) none of these

10. Amount of energy needed in charging a condenser of capacitance 5 muF to 20 KV is
(a) 1 KJ (b) 10 KJ (c) 100 KJ (d) 50 KJ

11. The capacitance of a parallel plate capacitor ________ by the introduction of a dielectric between the plates of the capacitors.
(a) increases (b) decreases (c) remains same (d) nothing can be said

12. In semiconductors ________ are responsible for the conduction
(a) electrons (b) holes (c) electrons and holes both (d) protons

13. The direction of propagation of electromagnetic wave is
(a) Parallel to (b) parallel to (c) parallel to (d) parallel to 14. The algebraic sum of all currents meeting at any point in an electrical circuit is
(a) infinite (b) positive (c) negative (d) zero

15. 64 identical drops each of 5 combine to form a big drop. What is the capacity of big drop?
(a) 16 (b) 20 (c) 4 (d) 25 