myclass24your class. your pace.

ScienceCLASS 7CBSE

answered 27 Mar 2026

You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done so?

A.VERIFIED ANSWERfact-checked by tutors

Soln:

The jerk will allow the mercury flow into the bulb above kink, which will make mercury level below normal temperature.

Suggested Q&A

SCIENCE · CLASS 7

ScienceCLASS 7
In 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 7
Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. Give reasons.
ScienceCLASS 7
Why is soil erosion relatively less in dense forests as compared to barren, open fields?
ScienceCLASS 7
Continuously water-logged soils are disadvantageous for plant growth. Why?
ScienceCLASS 7
15. 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 7
Rajasthan 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.