Work And Energy — Science STD 9 — Question

The mature cells in the mammalian body, i.e., RBC loses their capacity for:

Which of the following contribute to green house effect?

1. Methane (CH₄).
2. Carbon dioxide (CO₂).
3. Chlorofluorocarbons (CFCs).
4. All of these.

The S.I. unit of acceleration is:​

On the basis of composition of matter, milk is considered to be:

1. A pure substance.
2. An impure substance.
3. An element.
4. A compound.

In longitudinal waves, the particles vibrate in _______ direction of propagation:

A man stands at one end of a long steel pipe hits it with a hammer. Another man standing at the other end of the pipe hear 2 seconds. This is because:

Swim bladder is present in:

1. Bony fishes.
2. Cartilaginous fishes.
3. Toad.
4. Duck.

A water tanker filled up to two-thirds of its tank with water is running with a uniform speed. When the brakes are suddenly applied, the water in its tank would:

1. Move backward.
2. Move forward.
3. Rise upwards.
4. Remain unaffected.

A homogenous mixture of two solids is: