physics2

1) Kirchhoff’s second law (voltage law) is based on

a) conservation of charge

b) conservation of mass

c) conservation of energy

d) conservation of momentum

• a

• b

• c

• d

2) When unknown resistance is determined by meter bridge, the error due to contact resistance is

minimised by

a) connecting both the resistances only in one gap

b) interchanging the position of known and unknown resistances

c) using uniform wire

d) obtaining the null point near the ends of the wire

• a

• b

• c

• d

3) The SI unit of potential gradient is

a) V/cm b) V-m

c) V/m

d) V-cm

• a

• b

• c

• d

4) Instrument which can measure terminal potential difference as well as electromotive force

(emf) is

a) Wheatstone’s meter bridge

b) voltmeter

c) potentiometer

d) galvanometer

• a

• b

• c

• d

5) When null point is obtained in the potentiometer, the current is drawn from the

a) main battery

b) cell battery

c) both main and cell battery

d) neither main nor cell battery

• a

• b

• c

• d

6) If potential gradient of a wire decreases, then its length

a) remains constant

b) decreases

c) increases

d) none of the abov

• a

• b

• c

• d

7) Four resistances 4 Ω,8Ω, XΩ and 12Ω are connected in a series to form Wheatstone’s

network. If the network is balanced, the value of X is

a) 24 b) 18

c) 12

d) 8

• a

• b

• c

• d

1) According to right hand rule, the direction of magnetic induction if the current is directed in

anticlockwise direction is

(a) perpendicular and inwards (b) perpendicular and outwards

(c) same as current (d) opposite to that of current

• a

• b

• c

• d

2) A conductor has three segments; two straights of length L and a semicircular with radius R. It

carries a current I What is the magnetic field B at point P?

(𝑎)µ0𝐼/4πR

(𝑏)µ0/4π 𝐼/𝑅2

c)µ0𝐼/4R

d)µ0𝐼/4π

• a

• b

• c

• d

3) A strong magnetic field is applied on a stationary electron. Then the electron

(a) moves in the direction of the field

(b) remained stationary

(c) moves perpendicular to the direction of the field (d) moves opposite to the direction of the

field

• a

• b

• c

• d