Light — Science STD 7 — Question

A student wants to measure the speed of a ball rolling down a ramp. He found a few instruments which are listed in the lists.
(i) Hourglass
(ii) Thermometer
(iii) Measuring tape
(iv) Stopwatch
(v) Balance scale
Which of these are required to measure the speed of the ball?

Which instrument uses two plane mirrors?

Plenty of boiled water mixed with a pinch of salt and sugar dissolved in it is called.

Choose the correct order of terms that describe the process of nutrition in ruminants:

The device used to make or break an electric circuit is:

The layer which is difficult to dig with spade is called

Which olfactory indicator works only for bases?

Which among the following do not reproduce by vegetative reproduction?

A dark funnel shaped cloud that reaches from the sky to the ground is called a.

Which of the following plants uses animals for seed dispersal?