NDUS CENTRE OF ACADEM C LEARN NG, D.G.KHAN. PAPER: PHYS CS CLASS: X CH:6 TEST 12 MARKS: T ME: 1 H, 30 M NUTES 1. The S1 unit of viscosity is a. N –1 S –2 m b. NS –1 m c. N –2 mS d. N –1 S –1 m 2. When the droplet is moving with terminal velocity the net force acting on it a. zero b. maximum c. minimum d. uniform 3. The constant in equation of continuity in the flow of a. mass per area b. mass per unit time c. volume per unit time d. mass per unit volume 4. As the water falls its area of cross section decreases due to a. speed i ncreases b. speed decreases c. air pressure d. none !. "ernoulli#s theorem in $ased on a. conservation of momentum b. conservation of energy c. conservation of mass d. mass energy equivale nce %. &quation of continuity in $ased on a. conservation of momentum b. conservation of energy c. conservation of mass d. mass energy equivale nce '. A liquid moves through a hori(ontal pipe. The pressure is a. lower where diameter in large b.same through the pipe c.higher where diameter is large d.all ). *ormal systolic pressure for human is a. 120 torr b. 150 torr c. 75 torr d. zero torr +. 1 torr is equal to a. 133.3 m !2 b. 1"0 m !2 c. 133.3 d. zero 1,. The dimension of coefficient of viscosity are a. MLT –1 b. MLT – c. ML –1 T –1 d. ML T –1 11. -i scosity of liquid with rise in temp a. inc reases b. dec reases c. remain s const t d. none 12. The ma drag force on a falling sphere is +.) * its weight is a.1 b. #." c. 1#." d. ".# /uestions Short At tempt any five 1. !"y fog droplets appear to be suspended in air# 2. $xplain t"e difference bet%een laminar flo% and turbulent flo%. 3. T%o ro% boats moving parallel in t"e same direction are pulled to%ards eac" ot"er. $xplain 4. !"at is meant by drag f orce# !"at are t"e factors upon %"ic" drag force acting upon a small sp"ere of radius r& moving do%n t"roug" a liquid& depend# !. $xplain %"at do you understand by t"e term viscosity# %. ' pe rson is standing ne ar a fast moving train i s t"ere any danger t" at "e %ill fall to% ards it 0* /&ST*S Attempt any one /.1 a. State and prove equation of continuity. $. Water flows down hill through a closed vertical funnel. The flow speed at the top is 12., cms 51 . the flow speed at the $ottom is twice the speed at the top. f the funnel is 4,., cm long and the pressure at the top is 1.,13 1, ! *m 52 what is the pressure at the $ottom. /.2 a. State and prove "ernoulli#s &quation. $. Water flows through a hose whose internal diameter is 1 cm at a speed of 1 m s 61 . What should $e the diameter of the no((le if the water is to emerge at 21 m s 61 7

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INDUS CENTRE OF ACADEMIC LEARNING, D.G.KHAN.PAPER: PHYSICS CLASS: XI CH:6 TEST 12 MARKS: TIME: 1 H, 30 MINUTES1. The S1 unit of viscosity is

a. NEQ \* jc2 \* "Font:Georgia" \* hps11 \o\ad(\s\up 10(1),S)

EQ \* jc2 \* "Font:Georgia" \* hps11 \o\ad(\s\up 10(2),m)

b. NSEQ \* jc2 \* "Font:Georgia" \* hps11 \o\ad(\s\up 10(1),m)

c. NEQ \* jc2 \* "Font:Georgia" \* hps11 \o\ad(\s\up 10(2),m)S

d. NEQ \* jc2 \* "Font:Georgia" \* hps11 \o\ad(\s\up 10(1),S)

EQ \* jc2 \* "Font:Georgia" \* hps11 \o\ad(\s\up 10(1),m)2. When the droplet is moving with terminal velocity the net force acting on it

a. zero

b. maximum

c. minimum

d. uniform

3. The constant in equation of continuity in the flow of

a. mass per areab. mass per unit timec. volume per unit time d. mass per unit volume

4. As the water falls, its area of cross section decreases due to

a. speed increasesb. speed decreases

c. air pressure

d. none

5. Bernoullis theorem in based on

a. conservation of momentum

b. conservation of energy

c. conservation of mass

d. mass energy equivalence

6. Equation of continuity in based on

a. conservation of momentum

b. conservation of energy

c. conservation of mass

d. mass energy equivalence

7. A liquid moves through a horizontal pipe. The pressure is

a. lower where diameter in large b.same through the pipe c.higher where diameter is large d.all

8. Normal systolic pressure for human is

a. 120 torrb. 150 torrc. 75 torr

d. zero torr

9. 1 torr is equal to

a. 133.3 Nm2b. 180 Nm2c. 133.3 Nd. zero10. The dimension of coefficient of viscosity are

a. MLT1

b. MLT2

c. ML1T1

d. ML2T111. Viscosity of liquid with rise in temp

a. increases b. decreases c. remains consttd. none

12. The max drag force on a falling sphere is 9.8 N its weight is

a.1 N

b. 9.8 N

c. 19.8 N

d. 8.9 N

Questions ShortAttempt any five

1. Why fog droplets appear to be suspended in air?

2. Explain the difference between laminar flow and turbulent flow.

3. Two row boats moving parallel in the same direction are pulled towards each other. Explain

4. What is meant by drag force? What are the factors upon which drag force acting upon a small

sphere of radius r, moving down through a liquid, depend?

5. Explain what do you understand by the term viscosity?

6. A person is standing near a fast moving train is there any danger that he will fall towards it LONG QUESTIONSAttempt any one

Q.1 a. State and prove equation of continuity.

b. Water flows down hill through a closed vertical funnel. The flow speed at the top is 12.0 cms1. the flow speed at the bottom is twice the speed at the top. If the funnel is 40.0 cm long and the pressure at the top is 1.013 x 105 Nm2, what is the pressure at the bottom.

Q.2 a. State and prove Bernoullis Equation.

b. Water flows through a hose, whose internal diameter is 1 cm at a speed of 1 m s-1 .

What should be the diameter of the nozzle if the water is to emerge at 21 m s-1 ?

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