Science

Question 1

1A simple machine

Easy

A. makes work easier B. always increases distance and force together C. needs no force D. creates energy

Question 2

2Oiling machines can increase their efficiency.

Medium

A. True B. False

Question 3

3The SI unit of power is the

Easy

A. watt B. joule C. ampere D. newton

Question 4

4Scissors are levers of the

Hard

A. first class (fulcrum in the middle) B. third class C. second class D. fourth class

Question 5

5The SI unit of work is the

Easy

A. metre B. joule C. newton D. watt

Question 6

6A wheelbarrow is a second-class lever.

Medium

A. True B. False

Question 7

7The watt is the unit of power.

Easy

A. True B. False

Question 8

8A lever lifts a load of 400 N with an effort of 100 N. Find the mechanical advantage.

Medium

A. 0.25 B. 4 C. 40,000 D. 300

Question 9

9Work is done when

Easy

A. an object is at rest B. you think hard C. a force moves an object in the direction of the force D. a force is applied but nothing moves

Question 10

10A lever lifts a load of 300 N with an effort of 50 N. Find the mechanical advantage.

Medium

A. 15,000 B. 250 C. 6 D. 0.17