Question

Choose the correct answer : 15 x 1 = 15

1. Electric flux through the rectangular surface of area 50 sq.m. kept in the region

of uniform electric field 100 NC-1

inclined at an angle of 600

to the electric

field is a] 0.25 Nm2

c

-1

b) 250 Nm2

c

-1

c) 25 Nm2

c

-1 d) 2500 Nm2

c

-1

2. The electric potential V as a function of distance X (metres) is given by

V = (5x2

+10x-9) Volt. The value of electric field at a point x = 1m is

a) 20 Vm-1

b)6 Vm-1

c) 11 Vm-1

d) -23 Vm-1

3. Dielectric strength of air is 3 x 106Vm-1

. Suppose the radius of the hollow

sphere in the Vande Graff generator is R = 1m the maximum potential

difference created by this Vande Graff generator is ------- million volt

a) 1.5 b) 15 c) 30 d) 3

4. A parallel plate capacitor stores a charge Q at a Voltage V. suppose area of the

plates and the distance between the plates are each doubled then which is the

Quantity that will change?

a] Capacitance b) Charge c) Voltage d)Energy density

5. Number of electrons that constitute a current of 1 ampere in unit time through

a conductor is a) 1 electron b) 625 electrons

c) 6.25x1018 electrons d) 1x1020 electrons

6. The internal resistance of a 2.1V cell which gives a current of 0.2A through a

resistance of 10Ω is a] 0.2Ω b) 0.5Ω c) 0.8Ω d) 1.0Ω

7. In a Wheatstone’s bridge P = 100Ω, Q = 1000Ωand R = 40Ω.

if the galvanometer shows zero deflection, the value of S is

a] 400Ω b) 40Ω c) 4000Ω d) 4Ω

8. In Joule’s heating law when I and t are constant, if the H is taken along the Y

axis and I2

along the X axis the graph is

a] Ellipse b) circle c) parabola d) straight line

9. A toaster operating at 240 V has a resistance of 120 Ω the power is

a) 400 W b) 2W c) 480 W d) 240 W

10. If the conductor is placed along the direction of the magnetic field, the force

experienced by the conductor is

a] Maximum b) minimum c) Zero d) None of the above

11. A tangent galvanometer shows 600

deflection for a current of one ampere. If

the plane of the coil is rotated through 900

then for a current of 0.5 ampere

shows deflection of a) 30

0 b) 450

c) 600

d) 0​

Answer 1

Answer:

d)

Explanation:

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