1.Light year is the unit of…
a.intencity of light
b.distance
c.time
d.light
2. Light from the Sun reaches us in nearly
a.2 minute
b.12 minute
c.
8 minute
d.6 minute
3. The energy possessed by the water collected in the
reservoir of a dam
a.
kinetic energy
b.mechanical energy
c. electric energy
d. potential energy
4. Which of
the following is most elastic?
a. Rubber
b. Glass
c. Steel
d. Plastic
5. Magnetism at
the centre of a bar magnet is
a.Zero
b.Minimum
c.Maximum
d.Minimum or Maximum
6. Sound travels fastest in
a. air
b. water
c.vacuum
d. steel
7. The rear view mirror in a car is
a.convex
b. concave
c. plane
d. None of these
8. Light travels at the fastest speed in
a.glass
b.water
c.hydrogen
d.vacuum
9. Capacitor (condenser) is used in an electrical
circuit to
a. step down voltage
b. step up voltage
c. store electric charge
d. Produce electric charge
10. Optical
fibre works on the
a. principle
of refraction
b. total internal
reflection
c.scattering
d.
Interference