Deck 8: Physics: Speed on Rough Surfaces, Friction, Buoyant Force, and More

Question 1

When a bicycle travels on a rough surface, its speed

A)increases
B)decreases
C)remains the same
D)none of these

Answer 1

decreases

Question 2

It is difficult to walk on ice because of

A)absence of friction
B)absence of inertia
C)more inertia
D)more friction

Answer 2

absence of friction

Question 3

The law which defines force is

A)Newton's third law of motion
B)Newton's first law of motion
C)Newton's second law of motion
D)Newton's law of gravitation

Answer 3

Newton's first law of motion

Question 4

Friction between any two objects is due to

A)attraction between them
B)repulsion between them
C)some adhesive forces between them
D)irregularities on the surfaces

Question 5

Pascal is the unit for

A)pressure
B)thrust
C)buoyant force
D)None of these

Question 6

The mercury barometer was invented by

A)Celsius
B)Fahrenheit
C)Torricelli
D)Bernoulli

Question 7

The buoyant force depends on

A)depth of a liquid
B)colour of a liquid
C)density of liquid
D)none of these

Question 8

The hot air balloon rises because it is

A)denser
B)less dense
C)equally dense
D)the given statement is wrong

Question 9

A boat full of iron nails is floating on water in a lake. When the iron nails are removed, the water level

A)rises
B)falls
C)remains the same
D)nothing can be said

Question 10

An ice cube is floating in a glass of water. What happens to the water level when the ice melts?

A)rises
B)falls
C)remains same
D)first rises and then falls

Question 11

The branch of physics which deals with the study of fluids in motion is called

A)dynamics
B)hydrostatics
C)hydrodynamics
D)none of these

Question 12

Pressure is a

A)scalar quantity
B)vector quantity
C)normal force
D)all the above are wrong

Question 13

The upward force acting on the body immersed in a fluid is called

A)hydrostatic pressure
B)buoyant force
C)true weight
D)net force

Question 14

Work done upon a body is

A)a vector quantity
B)a scalar quantity
C)always positive
D)always negative

Question 15

the flowing water of a river possesses ______ energy.

A)gravitational
B)potential
C)electrical
D)kinetic

Question 16

The unit of power is

A)watt per second
B)joule
C)kilo joule
D)watt

Question 17

A bird flying in the sky has

A)K.E. only
B)P.E. only
C)neither K.E. nor P.E.
D)both K.E. and P.E.

Question 18

In summer, the clocks

A)become slow
B)become fast
C)gives correct time
D)lose time

Question 19

Therm is the unit of

A)heat
B)temperature
C)thermometry
D)work

Question 20

Heat flows as a result of difference of

A)temperatures
B)weights
C)masses
D)none of these

Question 21

The first thermometer was developed by

A)Joule
B)Fahrenheit
C)Galileo
D)Watt

Question 22

Soda bottles are made of thick glass so that they can withstand the

A)pressure in summer
B)temperature in summer
C)decrease in viscosity
D)increase in potential energy

Question 23

Evaporation is the process of changing liquid into vapour

A)at any temperature
B)above its boiling point
C)at its boiling point
D)below its boiling point

Question 24

The period of pendulum depends upon

A)mass
B)length
C)amplitude
D)energy

Question 25

Potential energy of the bob is maximum

A)at the mean position
B)at the extreme position
C)between the mean position and extreme positions
D)none of these