Physics | Study Mode

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Question 1

Which of the following statements is not correct?

molecules of ice, water and water vapour have equal intermolecular distances

molecules of ice, water and water vapour do not differ in the structure of their molecules

molecules of water vapour attract each other with forces far less than the forces of attraction between water molecules

water is less compressible than water vapour

Explanation

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Correct option: A

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Question 2

The density P of a spherical ball of diameter d and mass m is given by

P = \(\frac{3m}{4 \pi d^3}\)

p = 4\(\pi md^3\)

p = \(\frac{6m}{\pi d^3}\)

p = \(\frac{3m}{2 \pi d^3}\)

Explanation

p = \(\frac{M}{V} = \frac{M}{\frac{4}{3} \pi (\frac{d}{\pi})^3}\)

= \(\frac{6m}{\pi d^3}\)

Correct option: C

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Question 3

A metal rod of density 7000 kgm^-3 and cross-sectional area of 0.001257m² has a mass of 1.76kg. Calculate its length.

0.20m

0.25m

0.40m

0.50m

Explanation

P = \(\frac{M}{AL}\)

L = \(\frac{M}{CA}\)

= \(\frac{1.76}{7000 \times 0.001257}\)

= 0.2m

Correct option: A

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Question 4

The pressure in a liquid

is the same at all points in the liquid

decreases with depth

is the same in all directions at a given point

is equal to the atmospheric pressure

Explanation

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Correct option: C

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Question 5

The property of a fluid that is used to determine its suitability as a lubricant is its

capillarity

viscocity

surface tension

relative density

Explanation

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Correct option: B

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Question 6

The area under a velocity-time graph represents

final velocity attained

distance covered

acceleration

workdone

Explanation

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Correct option: B

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Question 7

In the absence of gravitational force, the weight of the body is

its mass

zero

its density

its volume

Explanation

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Correct option: B

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Question 8

Which of the following propeties is not considered in choosing mercury as a thermomemetric liquid?

density

expansivity

conductivity

opacity

Explanation

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Correct option: A

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Question 9

A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms^-2]

750.0J

225.0J

75.0J

22.5J

Explanation

K.E = P.E = mgh

= 0.3 x 10 x 100 - 0.3 x 10 x 75

= 75J

Correct option: C

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Question 10

A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule

60g

80g

120g

200g