# IGCSE Physics Paper-1: Specimen Questions with Answers 66 - 67 of 149

## Question number: 66

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### Question

The diagram shows a speed-time graph for a body moving with constant acceleration. Find slope of the graph?

Choice (4)

a.

speed

b.

acceleration

c.

distance

d.

time

b.

### Explanation

Here in above figure the graph of speed vs time is given. Here speed means velocity. Now, slope of the graph is given as,

But from definition of acceleration, the rate of change in velocity with respect to time is known as acceleration.

## Question number: 67

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### Question

Find work done in lifting each block and the power exerted by the laborer if some are heavy and other are light and are lifted for same distance in same time.

### Choices

Choice (4)

a.

Work done in lifting each block decrease and Power exerted by laborer remain same.

b.

Work done in lifting each block increase and Power exerted by laborer decreases.

c.

Work done in lifting each block remains same and Power exerted by laborer increases.

d.

Work done in lifting each block decrease and Power exerted by laborer decreases.

d.

### Explanation

Because of blocks are lighter, the work done in lifting each block decreases. Also time is same in both the cases so power exerted by laborer decreases.