Magnetic Effects of Electric Current — Science STD 10 — Question

A ray of light travelling in air goes into water. The angle of refraction will be:

The device used for producing electric current is called a:

Linear magnification produced by a concave mirror may be:

Which of the following does not belong to the group formed by the others:

Which of the following can undergo nuclear fusion reaction?

1. Uranium.
2. Deuterium.
3. Barium.
4. Krypton.

An old person is unable to see clearly nearby objects as well as distant object. To correct the vision, what kind of lens will he require?

The human eye can focus objects at different distances by adjusting the focal length of the eye-lens. This is due to:

1. Presbyopia.
2. Accommodation.
3. Near-sightedness.
4. Far-sightedness.

A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power:

1. +0.5D
2. -0.5D
3. +0.2D
4. -0.2D

Which statement/statements is/are correct?

Most of the sources of energy that we sue represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?

1. Wind energy.
2. Geothermal energy.
3. Fossil fuels.
4. Biomass.