Important one mark questions- physics
1. The number of lines of force that radiate outwards from one Coulomb charge is
(a) 1.13×1011 (b)8.85×10-11 (c) 9×109 (d) Infinite
2. If a point lies at a distance 'x' from the midpoint of the dipole, the electric potential at this point is proportional to
(a) 1/x2 (b) 1/x3 (c) 1/x4 (d) 1/x
3. A device not working with the principle of electrostatic induction is
(a) Van de Graff generator
(b) Microwave oven
(c) Both (a) and (b)
(d) lightning arrestor
4. SI unit of electric flux is
(a) Nm2C-1 (b) Nm-2C-2 (c) NmC2 (d) Nm2C2
5. Equivalent capacitance of two capacitors when connected in parallel is 8µF and when connected in series is 15/8 µF. Then the values of two capacitors are
(a) 7µF and 1µF (b) 6µF and 2µF
(c) 4µF and 4µF (d) 5µF and 3µF
6. Force experienced by a free electron in an electric field 'E' is
(a) Ee (b) E/e (c) e/E (d) Ee2
7. In the case of insulators, as the temperature decreases, resistivity
(a) Decreases (b) increases
(c) Remains constant (d) becomes zero
8. If the resistance of a coil is 2Ω at 0°c and α=0.004/°c then its resistance at 100°c is
(a) 1.4Ω (b) 0Ω (c) 4Ω (d) 2.8Ω
9. The tolerance of carbon resistors without a color ring is
(a) 20% (b) 10% (c) 2% (d) 25%
10. According to principle of potentiometer EMF of a cell is proportional to
(a) Material of the wire (b) Resistance
(c) Balancing length (d) none
No comments:
Post a Comment