Physics Test 115

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Physics Test 115

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Question 1
4 / -1

A liquid drop tends to have a spherical shape because

A
it has minimum surface energy

B
a sphere is the most symmetrical object

C
the viscosity does not allow it to spread out

D
the strong gravitational field of the earth does not allow it to have any other shape
Question 2
4 / -1

A capillary tube of radius 1 mm is 10cm long. What maximum height of water it can hold if it is immersed in water upto 5cm and then taken out of it ? (Surface Tension of water = 98 dynes/cm)

A
2 mm

B
2 cm

C
4 mm

D
4 cm

Solution

h = 2T/rdg

h = (2*98)/(0.005*1000*10)

= 196/50

= 3.92 cm

that is approximately equal to 4 cm.
Question 3
4 / -1

Ice floats in water contained in a vessel. When whole ice has melted, water temp. falls from. The water level will

A
first fall then rise

B
fall

C
rise

D
first rise then fall
Question 4
4 / -1

A beaker is partly filled with water. The mass of beaker and its contents is 100 gm. A block of wood having volume 20 c.c and density 0.5 is floated in beaker. The mass of the beaker and its contents, as read by a balance, will be

A
105 gm

B
110 gm

C
95 gm

D
90 gm
Question 5
4 / -1

A particle executes simple harmonic motion of amplitude A. At what distance from the mean position is its kinetic energy equal to its potential energy?

A
A/2

B
A/4

C
A / √2

D
√3 A/2
Question 6
4 / -1

Two soap bubbles of radii 4 mm & 6 mm are kept in contact. What is the radius of curvature at the junction of bubbles.

A
5 mm

B
4 mm

C
6 mm

D
none
Question 7
4 / -1

The time period of a simple pendulum with effective length equal to the radius of Earth (R) will be (g is acceleration due to gravity at the surface of earth)

A

B

C

D
infinite

Solution

When length is comparable to radius then T=2pi root under R/g(1+R/l) so if R=l then the ans would be C.
Question 8
4 / -1

When water droplets merge to form a bigger drop

A
energy is liberated

B
energy is absorbed

C
energy is neither liberated nor absorbed

D
energy may either be liberated or absorbed depending on the nature of the liquid.
Question 9
4 / -1

Which of the following quantities is always negative in a S.H.M.

A

B

C

D
both 2 & 3
Question 10
4 / -1

For the wave represented by the equation y = cm the wave velocity and the maximum particle velocity are

A
equal

B
100cm/s & 300cm/s

C

D