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

Q13.If the potential difference V applied across a conductor is increased to 2V with its temperature kept constant, free electrons in a conductor
(i) remain the same
(ii) become half of its previous value
(iii) be double of its initial value
(iv) become zero.

Q14.The equivalent resistance

(i) 3 ohms
(ii) 5.5 ohms
(iii) 7.5 ohms
(iv) 9.5 ohms

Q15. The SI unit of magnetic field intensity is
(i) AmN-1
(ii) NA-1m-1
(iii) NA-2m-2
(iv) NA-1m-2

Q16.The coil of a moving coil galvanometer is wound over a metal frame in order to
(i) reduce hysteresis
(ii) increase sensitivity
(iii) increase moment of inertia
(iv) provide electromagnetic damping

Q17.Two wires of the same length are shaped into a square of side ‘a’ and a circle with radius ‘r’. If they carry the same current, the ratio of their magnetic moment is
(i) 2 : π
(ii) π : 2
(iii) π : 4
(iv) 4 : π

Q18. The horizontal component of earth’s magnetic field at a place is √3 times the vertical component. The angle of dip at that place is
(i) π/6
(ii) π/3
(iii) π/4
(iv) 0

Q19. The small angle between magnetic axis and geographic axis at a place is-
(i) Magnetic meridian
(ii) Geographic meridian
(iii) Magnetic inclination
(iv) Magnetic Declination

Q20.Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon the
(i) rate at which current change in the two coils
(ii) relative position and orientation of the coils
(iii) rate at which voltage induced across two coils
(iv) currents in the two coils

Q21. A conducting square loop of side ‘L’ and resistance ‘R’ moves in its plane with the uniform velocity ‘v’ perpendicular to one of its sides. A magnetic induction ‘B’ constant in time and space pointing perpendicular and into the plane of the loop exists everywhere as shown in the figure. The current induced in the loop is

(i) BLv/R Clockwise
(ii) BLv/R Anticlockwise
(iii) 2BLv/R Anticlockwise
(iv)Zero

Q22. The magnetic flux linked with the coil (in Weber) is given by the equation –
Փ = 5t2 + 3t + 16
The induced EMF in the coil at time, t=4 will be
(i) -27 V
(ii) -43 V
(iii) -108 V
(iv) 210 V