#### Fluids English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

9th Standard

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Science

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

Part A

10 x 1 = 10
1. Clouds float in atmosphere because of their low

(a)

density

(b)

pressure

(c)

velocity

(d)

mass

2. In a pressure cooker, the food is cooked faster because

(a)

increased pressure lowers the boiling point

(b)

increased pressure raises the boiling point

(c)

decreased pressure raises the boiling point

(d)

increased pressure lowers the melting point

3. An empty plastic bottle closed with an airtight stopper is pushed down into a bucket filled with water. As the bottle is pushed down, there is an increasing force on the bottom as shown in graph. This is because

(a)

more volume of liquid is dispaced

(b)

more weight of liquid is displaced

(c)

pressure increases with depth

(d)

all the above

4. Unit of thrust is _____________.

(a)

Newton

(b)

Pascal

(c)

cm3

(d)

km

5. Instrument used to measure relative density

(a)

Hydrometer

(b)

Lactometer

(c)

Barometer

(d)

Pycnometer

6. In CGS system pressure is measured in ____________.

(a)

dyne cm-2

(b)

dyne

(c)

dyne cm-3

(d)

None

7. Heavy trucks are fitted with six to eight wheels, As area increases, Pressure will ___________.

(a)

decrease

(b)

increase

(c)

remains the same

8. Air gets ____________ as we go down below the sea level like mines

(a)

heavier

(b)

thinner

(c)

greater

(d)

lesser

9. An iron ball is weighed in air and then in water by a spring balance.

(a)

Its weight in air is more than in water.

(b)

Its weight in water is more than in air

(c)

Its weight is same both in air and water.

(d)

Its weight is zero in water.

10. When a solid is partly or wholly immersed in a fluid, it experiences an apparent loss in ____________.

(a)

weight

(b)

buoyant force

(c)

liquid displaced

(d)

None