Unit - 2.3 Temperature And Its Measurement — PHYSICS STD 6 — Question

Write the correct statements :
An ideal machine is possible in real life.

define the following : A parallel beam of light

What do you mean by a mean solar day ?

Answer the following.
List four natural sources of light.

State the effect produced by a force in the following case:
A man pushes a heavy cart

Answer the following in a word or two or in a sentence.
Given an example of a Class I lever.

Give one example of a class I lever in a case where the mechanical advantage is less than 1?

Explain in brief why birds that walk on the leaves floating on the surface of water have wide feet.

Give a reason for the following.
Electromagnets are temporary magnets.

An aeroplane leaves Bengaluru at 23:50 hours and reaches Chennai at 00.40 hours. Rewrite the statement using a 12-hour time format. Also find the duration of the flight.