Physics Sample Question Paper for Term 1 (CBSE Board exam for 2021-22) – paper code 042

Q31.Which among the following, is not a cause for power loss in a transformer-

(i) Eddy currents are produced in the soft iron core of a transformer.
(ii) Electric Flux sharing is not properly done in primary and secondary
coils.
(iii) Humming sound produced in the transformers due to magnetostriction.
(iv) Primary coil is made up of a very thick copper wire.

Q32.An alternating voltage source of variable angular frequency ‘w’ and fixed amplitude ‘V’ is connected in series with a capacitance C and electric bulb of resistance R(inductance zero). When ‘w’ is increased-
(i) The bulb glows dimmer.
(ii) The bulb glows brighter.
(iii) Net impedance of the circuit remains unchanged.
(iv) Total impedance of the circuit increases.

Q33. A solid spherical conductor has charge +Q and radius R. It is surrounded by a solid spherical shell with charge -Q, inner radius 2R, and outer radius 3R. Which of the following statements is true?

(i)The electric potential has a maximum magnitude at C and the electric field has a maximum magnitude at A
(ii) The electric potential has a maximum magnitude at D and the electric field has a maximum magnitude at B.
(iii) The electric potential at A is zero and the electric field has a maximum magnitude at D.
(iv). Both the electric potential and electric field achieve a maximum magnitude at B.

Q34. A battery is connected to the conductor of non-uniform cross section area. The quantities or quantity which remains constant is-
(i) electric field only
(ii) drift speed and electric field
(iii)electric field and current
(iv) current only

Q35. Three resistors having values R battery. Suppose R1 carries a current of 2.0 A, R ohms, and R3 dissipates 6.0 watts of power. Then the voltage across R
is-
(i) 1V
(ii) 2V
(iii) 3V
(iv) 4V

Continued:..