Question

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Answer 1

Answer:

Ans 43: Materials like air, water, and clear glass are called transparent. When light encounters transparent materials, almost all of it passes directly through them. ... Materials like frosted glass and some plastics are called translucent. When light strikes translucent materials, only some of the light passes through them.

Ans 44: Among different components of mixture there are many substances which are harmful or not useful for us. To remove these harmful or unuseful components we need to separate them. For example: (a) Tea leaves are separated from the liquid with a strainer while preparing tea.

Ans 45: Our elbow cannot move backwards because it has a hinge joint which allows the movement in one plane only.

Ans 46:A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.

Explanation:

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Answer 2

Answer:

We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components.

Our elbow cannot move back because it has a hinge joint which allows the movement in one plane only.

A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.