Which of the following cannot be used for the measurement of time? (a) A leaking tap. (b) Simple pendulum. (c) Shadow of an object during the day. (d) Blinking of eyes.
ScienceClass 7CBSEAnswered 27 Mar 2026
Answer
Soln:
The answer is (d) Blinking of eyes.
Explanation:
Blinking of the eye is not a periodic phenomenon. Eyes do not blink at a fixed interval of time. Hence Blinking of eyes cannot be used for measurement of time.
Suggested Q&A
Science · Class 7- ScienceClass 7In towns and cities, generally, bore wells have to be dug very deep to get water as compared to bore wells dug in villages. Give suitable reasons.
- ScienceClass 7Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. Give reasons.
- ScienceClass 7Why is soil erosion relatively less in dense forests as compared to barren, open fields?
- ScienceClass 7Continuously water-logged soils are disadvantageous for plant growth. Why?
- ScienceClass 715. Match the animals in Column I with their natural place of dwelling (habitat) in Column II. Column-I Column-II a) Earthworm i) Sand and beaches b) Garden Lizard ii) Burrows in soil c) Crab iii) Deep, narrow holes in dry soils d) Rodents iv) Surface of soil e) Scorpion v) Surface of shaded moist soils f) Snails and snugs vi) A horizon of moist soils
- ScienceClass 7Rajasthan is a desert state in India. Once while travelling to Rajasthan by train, Boojho observed several streams and rivulets of rainwater during the journey, but to his surprise, he did not see streams of water in the desert region even during rains. Help Boojho find a suitable explanation for this.