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Published on: 21/10/2025
Download CBSE Class 11th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Physics
Questions + Answers key
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1.
In a turbulent flow, the velocity of the liquid molecules in contact with the walls of the tube is
zero
maximum
equal to critical velocity
may have any value
2.
Reynold's number (Re) can be defined as
\(\frac{\rho \eta}{v d}\)
\(v d / \rho\)
\(\frac{\rho v d}{\eta d}\)
\(d \rho v / \eta\)
3.
As the temperature of water increases, its viscosity
remains unchanged
decreases
increases
increases or decreases depending on the external pressure
4.
In a soap bubble, pressure difference is
\(\frac{2 S_{l a}}{r}\)
\(\frac{4 S_{l a}}{r}\)
\(\frac{S_{l a}}{r}\)
\(\frac{8 S_{l a}}{r}\)
5.
Why are drops and bubbles spherical?
Surface with minimum energy
Surface with maximum energy
High pressure
Low pressure
6.
The force required to separate two glass plates of 10-2m2 with a film of water 0.05 mm thick between them, is (surface tension of water is 70 x 10- 3 Nm1 )
28 N
14 N
50 N
38 N
7.
Radius of a soap bubble is increased from R to 2R. Work done in this process in terms of surface tension is
\(24 \pi R^{2} S\)
\(48 \pi R^{2} S\)
\(12 \pi R^{2} S\)
\(36 \pi R^{2} S\)
8.
Surface tension is due to
frictional forces between molecules
cohesive forces between molecules
adhesive forces between molecules
Both (b) and (c)
9.
The two thin bones (femurs), each of cross-sectional area 10 cm 2 support the upper part of human body of mass 40 kg. Estimate the average pressure sustained by the femurs
2 x 105 Nm-2
3 x 104 Nm-2
2.5 x 103 Nm -2
6 x 104 Nm-2
10.
The density of water at 4°C is
1.0 x 103 kgm-3
4 x 102 kgm-3
6 x103 kgm-3
3.2 x 103 kgm-3
11.
At which of the following temperature, the value of surface tension of water is minimum?
4°C
25°C
50°C
75°C
12.
What is the shape when a non-wetting liquid in displaced in a capillary tube?
Concave upwards
Convex upwards
Concave downwards
Convex downwards
13.
The Bernauli's Theorem is based on the conservation of:
mass
energy
momentum
all
14.
A U-tube of uniform section (shown in fig.) is partially filled With liquid l. Another liquid II which does not mix with liquid I is poured into one side. It is found that the liquid levels of the two sides of the tube are the same, While the level of liquid I has risen by 2 cm. If specific gravity of liquid I is 1 .1. then the specific gravity of liquid II must be
1.12
1.1
1.05
1.0
15.
Two stretched Of areas 2m2 and 3m2 are placed in a liquid at the Same deßthl The ratio Of the pressures on them is
1:1
2:3
√2:√3
22 : 33
16.
A soap bubble of diameter 8 mm is formed in air.The surface tension of liquid is 30 dyne/cm.The excess pressure inside the soap bubble is
150 dyne / cm2
300 dyne / cm2
3 x 10-3 dyne / cm2
12 dyne / cm2
17.
The surface tension of a liquid is 5 newton per metre.If a film is held on a ring of area 0.02m2, its surface energy is about
5 x 10-2 joule
2.5 x 10-2 joule
2 x 10-1 joule
3 x 10-1 joule
18.
Two tubes of sarne material but of different radii in a liquid. The height which liquid rises in tube is 22 cm Md in the is 6.6cm.The ratio of their radii is
9:1
1:9
3:1
1:3
19.
The height of Liquid column in a capillary tube is If this experiment is on the surface moon, the height will be:
h
h/6
6h
9.8h
20.
A plate of area 10cm2 is separated from plate by a 1mm thick layer of glycerine. If thx coefficient of viscosity is 20 poise then required to move the upper plate with a velocity of 1cm/sec. over the lower one is
80 dyne
800 dyne
200 dyne
2000 dyne
21.
A lead sphere Of mass m falls in a viscous liquid with a terminal velocity v0. Another lead sphere of mass will fall through the same liquid with a terminal velocity
v0
4v0âââââââ
8v0âââââââ
64v0âââââââ
22.
A cylindrical vessel, half filled with kerosene takes 10 minutes to get emptied from a hole at the bottom Of the vessel. The time taken to get it emptied if it were completely filled with kerosene Will be
20√2 minutes
30√2 minutes
25√2 minutes
10√2 minutes
23.
Velocity of liquid above which the flow becomes turbulent is called
terminal velocity
critical velocity
Velocity gradient
none of the above
24.
Hot Syrup flows faster because it has
higher surface tension
lower viscosity
higher viscosity
higher terminal velocity
25.
The angle between viscous force and direction of flow is
900
1800
00
3600
1.
(d)
may have any value
2.
(d)
\(d \rho v / \eta\)
3.
(b)
decreases
4.
(b)
\(\frac{4 S_{l a}}{r}\)
5.
(a)
Surface with minimum energy
6.
(a)
28 N
7.
(a)
\(24 \pi R^{2} S\)
8.
(d)
Both (b) and (c)
9.
(a)
2 x 105 Nm-2
10.
(a)
1.0 x 103 kgm-3
11.
(d)
75°C
12.
(c)
Concave downwards
13.
(b)
energy
14.
(b)
1.1
15.
(a)
1:1
16.
(a)
150 dyne / cm2
17.
(a)
5 x 10-2 joule
18.
(a)
9:1
19.
(c)
6h
20.
(d)
2000 dyne
21.
(b)
4v0âââââââ
22.
(d)
10√2 minutes
23.
(b)
critical velocity
24.
(b)
lower viscosity
25.
(b)
1800
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