7.
A thin pin of iron can be made to float on water-drinking in a bowl. This phenomenon is due to the
Answer : D. Surface tension of water
8.
An astronaut of mass 60 kg is revolving around the Earth in a satellite. What will be his weight inside the satellite (assuming g = 10 m/s)?
Answer : B. Zero
9.
For which one of the following is capillary not the reason only?
Answer : B. Rising of underground water
10.
Which one of the following remains constant while throwing the ball upward?
Answer : B. Acceleration
11.
Which one of the following reactions is the main cause of the energy radiation from the sun
Answer : B. Fusion reaction
12.
When light enters from air to water, then its
Answer : C. Frequency is same but the wavelength is smaller in water than in air
