Tissues — Science STD 9 — Question

What is the speed of a train which overtakes, a man walking at a speed of 5 km/ h in 30 seconds, if the train is 274 metres long?

Speed is to velocity as:

Which of the following is the exception of cell theory?

Dolphins, bats and porpoise use ……… for navigation and location of food in the dark.

What happens when there is no interaction between the objects:

While preparing a slide for observing onion peel under a microscope, the onion peel is immediately kept in a watch-glass containing a drop of water. Why this is done?

Molecular mass is defined as the :

Delay in the observation of onion cells can lead to:

Which of the following is unit of power?

The isotopes of an element have different number of: