1. Which of the following is not true about step-up transformer?

a. The current in the secondary coil is less than in the primary coil

b. The voltage in the secondary coil is less than in the primary coil

c. The voltage in the secondary coil is greater than in the primary coil

d. The number of loops in the secondary coil is greater than in the primary coil

2. The property of light producing dark and bright band on a screen after light passes through two slits.

a. refraction

b. interference

c. diffraction

d. polarization

3. A step-down transformer is used to light a 12V lamp from a 240V mains supply. The lamp lights at normal brightness. The primary coil has 600 turns. How many turns are in the secondary coil?

a. 49

b. 98

c. 50

d. 99