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1 Physics MCQs

The sun appears red at sunrise and sunset while it appears white at noon, because:

  • Of refraction
  • It is cooler at sunrise and at sunset
  • Of diffraction leading to red end of the spectrum reaching the earth
  • Of scattering of light due to dust particles and air molecules.
0 Comments
Correct Answer: D. Of scattering of light due to dust particles and air molecules.

Explanation:

The sun appears red at sunrise and sunset due to a ... Read More Details

2 Physics MCQs

An iceberg is floating in sea. How much of its mass will remain above the surface of water?

  • One tenth
  • One fifth
  • One fourth
  • One third
0 Comments
Correct Answer: A. One tenth

Explanation:

An iceberg floats in seawater because its density is lower than that of ... Read More Details

3 Environmental Science MCQs

Most of the ozone in the atmosphere is concentrated in the _____________?

  • Mesosphere
  • Troposphere
  • Stratosphere
  • Ionosphere
0 Comments
Correct Answer: C. Stratosphere

Explanation:

The ozone layer is a region of Earth’s atmosphere that contains ... Read More Details

4 Physics MCQs

T.V. transmission cannot cover a very large area because:

  • The strength of T.V. waves is very limited
  • Picture cannot be transmitted clearly after a specific distance
  • The shape of the earth is spherical
  • The air is not a good conductor of light and sound/waves
0 Comments
Correct Answer: C. The shape of the earth is spherical

Explanation:

Television (TV) transmission works by sending electromagnetic waves, specifically radio waves, ... Read More Details

5 Environmental Science MCQs

The Green House Effect is caused by an excess of?

  • Carbon dioxide
  • Carbon monoxide
  • Carbon tetrachloride
  • None of the above
0 Comments
Correct Answer: A. Carbon dioxide

Explanation:

The greenhouse effect is a natural phenomenon that keeps the Earth ... Read More Details

6 Biology Mcqs

Bats can also fly in dark because they are capable of taking the help of _________?

  • Ultraviolet Waves
  • Ultrasonic Waves
  • Electromagnetic Waves
  • Special Retina
0 Comments
Correct Answer: B. Ultrasonic Waves

Explanation:

Bats are nocturnal mammals that are able to fly and hunt effectively even ... Read More Details

7 Physics MCQs

What is ‘Stealth Technology‘?

  • A device which when attached to an aircraft makes it invisible on the radar
  • A coating which reduces the visibility of an aircraft on radar
  • A technology by which it is possible for the aircraft’s to spy in the enemy air-space
  • A technology by using which paratroopers can be dropped stealthily behind the enemy columns
0 Comments
Correct Answer: B. A coating which reduces the visibility of an aircraft on radar

Explanation:

Stealth technology is a set of advanced engineering techniques used to make aircraft, ... Read More Details

8 Physics MCQs

The rear view mirror of a motor vehicle is ________?

  • Concave
  • Plane
  • Convex
  • Biconcave
0 Comments
Correct Answer: C. Convex

Explanation:

The rear-view mirror of a motor vehicle is convex because a ... Read More Details

9 Physics MCQs

Lead ball falls through water more slowly than through air because __________?

  • The value of ‘g’ is less in water
  • Density of air is less than that of water
  • Of the viscous force in water
  • Of the surface tension of water
0 Comments
Correct Answer: C. Of the viscous force in water

Explanation:

A lead ball falls through water more slowly than through air ... Read More Details

10 Physics MCQs

Which one of the following sets of color combinations is added in color vision in TV’?

  • Red, green and blue
  • Orange, black and violet
  • White, red and yellow
  • Yellow, green and blue
0 Comments
Correct Answer: A. Red, green and blue

Explanation:

Color televisions create images using the additive color mixing principle, where ... Read More Details

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