The Fundamental Unit of Life — Science STD 9 — Question

Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 

Which of the following is parasitic protozoan?

1. Amoeba.
2. Entamoeba.
3. Euglena.
4. Paramecium.

On what factor does speed of wave depends:

Which of the following statement is or are incorrect about the growing crops inside green-houses?

A sprinter has to cover a total run of 100m. She increases her speed from rest under a uniform acceleration of 1.0m/s² up to three quarters of the total run and covers the last quarter him uniform speed. The time she takes to cover the first half, and to cover the second half of the run will be.

Define velocity.State its unit:

'The action and reaction both act simultaneously.' Is this statement true and what is the net force:

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be:

1. P.
2. Q.
3. R.
4. S.

Cell theory was given by:

The velocities of sound waves in four media P. Q, R and S are 18,000km/h, 900km/h, 0km/h, and 1200km/h respectively. Which medium could be a liquid substance?

1. P
2. Q
3. R
4. S