Physics

Question 1

1A single fixed pulley has a velocity ratio of 2.

Easy

A. True B. False

Question 2

2A wheelbarrow is a lever of the

Easy

A. second class B. third class C. first class D. pulley type

Question 3

3The velocity ratio of a screw jack is

Hard

A. r ÷ pitch B. pitch × r C. 2πr ÷ pitch D. pitch ÷ 2πr

Question 4

4A machine lifts 200 N with an effort of 50 N. Its mechanical advantage is ___.

Easy

Your answer (fill in the blank)

Question 5

5A machine of velocity ratio 4 lifts a load of 300 N with an effort of 150 N. Find its efficiency.

Medium

A. 8% B. 200% C. 50% D. 51%

Question 6

6The velocity ratio of a wheel and axle is

Medium

A. wheel × axle B. radius of wheel ÷ radius of axle C. radius of axle ÷ radius of wheel D. one

Question 7

7Work output of a machine can be greater than work input.

Easy

A. True B. False

Question 8

8A machine lifts a load of 300 N with an effort of 80 N. Find its mechanical advantage.

Easy

A. 220 B. 3.75 C. 7.5 D. 0.267

Question 9

9Fishing rods and tweezers are levers of the

Easy

A. first class B. screw type C. third class D. second class

Question 10

10A pair of scissors is a lever of the

Easy

A. fourth class B. third class C. second class D. first class