Question

(b) The motion in a
motion.
.... is rectilinear​

Answer 1

Explanation:

11. Which of the following is not a forest product?

(i) Gum

(ii) Plywood

(iii) Sealing wax

(iv) Kerosene

Solution:

The answer is (iv) Kerosene

12. Which of the following statements is not correct?

(i) Forests protect the soil from erosion.

(ii) Plants and animals in a forest are not dependent on one another.

(iii) Forests influence the climate and water cycle.

(iv) Soil helps forests to grow and regenerate.

Solution:

Statement (ii) Plants and animals in a forest are not dependent on one another – is incorrect

13. Micro-organisms act upon the dead plants to produce

(i) sand (ii) mushrooms (iii) humus (iv) wood

Solution:

Answer is (iii) humus

Answer 2

Explanation:

If a particle is restricted to move along a straight line, its motion is called rectilinear (or linear) motion. Such a motion can be described using one coordinate only. Displacement of the particle and its derivatives i.e. velocity and acceleration all are one-dimensional vectors.