The Fundamental Unit of Life — Science STD 9 — Question

Which one of the following statements about power stations is not true?

A freely falling object travels 4.9m in 1st second, 14.7m in 2nd second, 24.5m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of:

1. Uniform motion.
2. Uniform acceleration.
3. No acceleration.
4. Uniform velocity.

Which among the following is the commercial unit of electrical energy?

Cardiac muscles are:

Identify the action involved in opening or shutting a door:

A microphone converts:

1. Electrical energy into sound energy in ordinary telephone.
2. Microwave energy into sound energy in a mobile phone.
3. Sound energy into mechanical energy in a stereo system.
4. Sound energy into electrical energy in public address system.

Which of the following pair of elements represents a mole ratio of 1 : 1?

1. 10g of calcium and 12g of magnesium.
2. 12g of magnesium and 6g of carbon.
3. 12g of carbon and 20g of calcium.
4. 20g of sodium and 20g of calcium.

Gravitational force between two objects is 10N. If masses of both objects are doubled without changing distance between them, then the gravitational force would become:

When a rubber balloon held between the hands is pressed, its shape changes. This happens because:

1. Balanced forces act on the balloon.
2. Unbalanced forces act on the balloon.
3. Frictional forces act on the balloon.
4. Gravitational forces act on the balloon.

Mucosal living of which organ differ from others in concern with number of layer of cell (simple/ strtified)?