Important Questions of Exploring the Nature of Science Science | Zigya

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21.

Conduction of thermal energy takes place in

  • solids

  • liquids

  • gases

  • All of these


22.

Following is not a property of radiation

  • It travels with velocity of light

  • Medium is necessary for propagation

  • Its nature is electromagnetic

  • It has quantum nature


23.

Which of the following characteristics of sound depend on the amplitude of vibrations?

  • Speed

  • Pitch

  • Loudness

  • Quality


24.

The amount of matter in same weight will be

  • least at North pole

  • least at equator

  • least at Moon

  • same at all of the above places


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25.

Select the group of poor conductors of heat from the following.'

  • Air, water, plastic

  • Wool, wood, iron

  • Water, copper, wood

  • Air, aluminium, wool


26.

Select the one which is different from the others in the manner it is applied.

  • Electrostatic force

  • Frictional force

  • Gravitational force

  • Magnetic force


27.

While teaching the topic on 'Motion and Time' to Class VII students, Savita gave examples of different kinds of motion to the students. Which one of the following examples was quoted by her incorrectly?

  • Motion of a boy sitting in a moving car in relation to the car

  • Motion of a boy sitting in a merry-go-round

  • Motion of the hammer of an electric bell

  • Motion of a cricket ball hit by a batsman


28.

Which one of the following is not an example of electromagnetic waves?

  • Ultraviolet rays

  • Radio waves

  • X-rays

  • Sound waves in air


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29.

Radiation with maximum penetration power is

  • infrared radiation

  • ultraviolet radiation

  • X-rays

  • γ-rays


30.

The mass of man is 72 kg at Earth. The value of g at the Moon's surface is 1/6 of that on the Earth. The mass of man at the Moon will be

  • 12 kg

  • 120 kg

  • 72 kg

  • 432 kg


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