Microwave oven consumes less power due to:

• small frequency of radiation

• short wavelength of radiation

• large frequency as well as wavelength of radiation

• small frequency as well as wavelength of radiation

372.

The sun is constantly radiating energy and yet its surface temperature is nearly constant at 6000°C. The constancy of solar temperature is due to:

• fission

• radioactivity

• fusion

• black hole evaporation

An annular solar eclipse occurred during January 2010 with a duration of annularity around 12 minutes. It is predicted that such a long annular duration will not occur till the year 3043. Such prediction is possible due to:

• Einstein's theory of relativity

• Darwin's theory of natural selection

• Newton's theory of gravitation

• Hawking's theory of black hole

Internet communication uses optical fiber cables because of:

• low cost

• free from virus threat

• high data carrying capacity

• faster than light communication of signals

Metal pipes used to carry water sometimes burst in the winter. This is because:

• water expands when it freezes

• metal contracts more than water

• outside of the pipe contracts more than inside

• metal expands more than water

Which one of the following characteristics of the particle does the shaded area of the velocity-time graph shown above represent?

• Momentum

• Acceleration

• Distance covered

• Speed

A body is at rest on the surface of the earth. Which one among the following statements is correct regarding this?

• No force is acting on the body

• Only weight of the body acts on it

• Net downward force is equal to the net upward force

• None of the above statements is correct

A pendulum beats faster than a standard pendulum. In order to bring it to the standard beat, the length of the pendulum is to be:

• reduced

• increased

• reduced and the mass of the bob increased

• reduced and also the mass of the bob reduced

Two identical blocks of ice, A, and B float in water as shown in the figure given above. Which one among the following statements in this regard is correct?

• Block A displaces a greater volume of water since the pressure acts on a smaller bottom area

• Block A displaces a greater volume of water since its submerged end is lower in the water

• Block B displaces a greater volume of water since its submerged end has a greater area in water

• The two blocks displace equal volumes of water since they have the same specific gravity and same mass

When a ship floats on water:

• it displaces no water

• the mass of water displaced is equal to the mass of the ship

• the mass of water displaced is lesser than the mass of the ship

• the mass of water displaced is greater than the mass of the ship