Presence of ozone in the atmosphere is important because it absorbs _____.

Which of the following statements about optical microscope is/are correct?

1. Both the eyepiece and objective of a microscope are convex lenses.

2. The magnification of a microscope increases with increase in focal length of the objective.

3. The magnification of a microscope depends upon the length of the microscope tube.

4. The eyepiece of a microscope is a concave lens.

Select the correct answer using the codes given below:

The following question consists of two statements, Statement-I and statement-II. Examine these two statements carefully and select the correct answer using the codes given below.

Assertion (A): A body which is suspended from a spring balance is partially immersed in a liquid. The spring balance reading will show a value equal to weight of the body.

Reason (R): A body immersed in a liquid experiences an upward thrust which is equal to the weight of the liquid displaced by it.

Which among the following is/are the reasons behind using mercury in thermometers?

1. Mercury does not wet the inner sides of the thermometer.

2. It can be seen easily in a thin capillary tube of the thermometer.

3. It is a good conductor of heat.

4. It is non-toxic.

Select the correct answer using the codes given below.