Human Eye and Colourful World — Science STD 10 — Question

Consider two statements A and B given below:

1. Real image is always inverted.
2. Virtual image is always erect.

Out of these two statements:

1. Only A is true.
2. Only B is true.
3. Both A and B are true.
4. None is true.

Which one of the following sets includes all homologous organs?

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.

One coulomb charge is equivalent to the charge contained in:

1. 2.6 × 10¹⁹ electrons.
2. 6.2 × 10¹⁹ electrons.
3. 2.65 × 10¹⁸ electrons.
4. 6.25 × 10¹⁸ electrons.

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure?

Which of the following is ultimately not derived from the sun's energy (or solar energy)?

1. Wind energy.
2. Nuclear energy.
3. Biomass energy.
4. Ocean thermal energy.

Linear magnification (m) produced by a rear view mirror fitted in vehicles:

As light from a far off star comes down towards the earth:

In order to obtain a magnification of, -3 (minus 3) with a convex lens, the object should be placed:

1. Between optical centre and F.
2. Between F and 2F.
3. At 2F.
4. Beyond 2F.