electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

Question : 1 [RAS/RTS (Pre) 2003]

How many units of electricity will be consumed if you use a 60 watt electric bulb for 5 hours everyday for 30 days?

a) 6

b) 12

c) 9

d) 3

Question : 2 [NDA]

A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?

a) + 0. 8 D

b) – 0.8 D

c) – 3.0 D

d) + 3.0 D

Question : 3

Magnetic meridian is a

a) vertical plane

b) point

c) horizontal plane

d) line along N-S

Question : 4

When an iron bar is moved over a bar magnet along its length the attractive force

a) remains same

b) increases first and then decreases

c) decreases first and then increases

d) cannot say

Question : 5 [CDS]

Consider the following statements

1. Clear sky appears blue due to poor scattering of blue wavelength of visible light.
2. Red part of light shows more scattering than blue light in the atmosphere.
3. In the absence of atmosphere, there would be no scattering of light and sky will look black.

a) Only 3

b) Only 1

c) 1 and 2

d) All of these