PHYSICS Forum By ChampStreet

Vaibhav from DPS, Bangalore

Subject :Physics Class : Class 7

In this section each question contains statements given in two columns which have to be matched. Statements (p, q, r, s, t) in Column-I have to be matched with statements (p, q, r, s, t) in Column-II.

A p-(i), q-(ii), r-(iii), s-(iv), t-(v)
B p-(i), q-(ii), r-(iv), s-(v), t-(iii)
C p-(iii), q-(v), r-(i), s-(ii), t-(iv)
D p-(iii), q-(v), r-(i), s-(ii), t-(iv)

Options C and D are same.

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chinmaymahajan from RUSTOMJIE INTERNATIONAL SCHOOL, JALGAON

Subject :Physics Class : Class 7

A clock works on the principle of

A periodic motion
B oscillation
C translation
D rotation

why cant oscillation be the answer

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Apra Narain from dfds, Greater Noida

Subject :Physics Class : Class 7

On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?

A On heating glass expands and lid contracts.
B On heating lid expands more than the neck and thus slides easily.
C Neck becomes slippery on heating.
D Lid of the bottle cannot bear the heat.

Explain please

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