Question 4771:

an image which can be formed on a screen is said to be ____________

A. Burred
B. Road
C. Virtual
D. Inverted

Question 4772:

which of the following is of a colour in white light?

A. Red
B. Green
C. Orange
D. Magenta

Question 4773:

The magnification of a lens is 4. If the height of an object.
what is the height of image?

A. 60cm
B. 48cm
C. 24cm
D. 40cm

Question 4774:

The critical angle in a medium is 300. what is the refractive index of the medium

A. 2.0
B. 1.5
C. 1.2
D. 1.3

Question 4775:

Amelectric motor run under a p.d of 40v and take a current of 1.5 from the supply.
What energy is used up by the motor in 50 seconds

A. 3000J
B. 15000J
C. 550K
D. 1350