Question

4.Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability? (a) It is more than 7 metres high (b) It weighs about 6000 kg (c) It was built more than 1600 years ago (d) It has not rusted after such a long period

5. Which is the formula of ozone? (a) Fe2O3 (b) Fe3O2 (c) O2 (d) O3

6. When a new substance is formed with different properties than those of the original substance, it is called a (a) chemical change (b) physical change (c) freezing (d) boiling

7. State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.

(b) Anaerobic bacteria digest animal waste and produce biogas.

(c) Ships suffer a lot of damage though they are painted.

(d) Stretching of the rubber band is not a physical change.

8. The image formed by spherical mirror is virtual. The mirror will be (a) concave (b) convex (c) either concave or convex (d) none of these

9. The coloured band of light obtained by dispersion of light is called (a) image (b) spectrum (c) convergence (d) scattering

10. We can get an inverted image from (a) both concave lens and convex lens. (b) both concave mirror and convex mirror. (c) both concave mirror and convex lens. (d) both convex mirror and concave lens

11. A convex lens is (a) thick at centre (b) thin at the centre (c) thick at edges (d) hollow at the centre

Answer 1

Answer:

4.D

5.D

6.A

7.true,idk,idk,false

8.A(concave)

9.spectrum

Answer 2

Answer:

i don't know the ans but I can tell that it is from gk