#### Forces and Pressure English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

8th Standard

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Science

Time : 00:10:00 Hrs
Total Marks : 10

Part A

10 x 1 = 10
1. Pressure exerted by a liquid is increased by

(a)

the density of the liquid

(b)

the height of the liquid column

(c)

Both (a) & (b)

(d)

None of the above

2. Unit of pressure is

(a)

pascal

(b)

N m–2

(c)

poise

(d)

Both (a) & (b)

3. The value of the atmospheric pressure at sea level is

(a)

76 cm of mercury column

(b)

760 cm of mercury column

(c)

176 cm of mercury column

(d)

7.6 cm of mercury column

4. Pascal’s law is used in

(a)

hydraulic lift

(b)

brake system

(c)

pressing heavy bundles

(d)

All the above

5. Which of the following liquids has more viscosity?

(a)

Grease

(b)

Water

(c)

Coconut oil

(d)

Ghee

6. _______is the force acting perpendicularly on any given surface area of a body

(a)

Pressure

(b)

Thrust

(c)

Density

(d)

Volume

7. Even if we tilt the barometric tube at various angles, the level of mercury will______

(a)

Not vary

(b)

increases

(c)

decreases

(d)

charge

8. Rain drops are spherical in nature because of _________

(a)

Frictional force

(b)

Buoyant force

(c)

Surface tension

(d)

Viscous force

9. The unit for surface tension is _________

(a)

Nm

(b)

N-1m

(c)

N-1m-1

(d)

Nm-1

10. If the area of contact is greater, then the ______ will be greater.

(a)

Pressure

(b)

Temperature

(c)

Friction

(d)

Force