Physical Science Objective Type Questions and Answers

21 Young’s modulus is the property of

A Gas only

B Both Solid and Liquid

C Liquid only

D Solid only

View Answer

Answer: Solid only

22 What is refractive index ?

A it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

B it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

C it is defined as the product of speed of light in medium and in vacuum.

D None of the above

View Answer

Answer: it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

23 Name of the instrument to measure atomspheric pressure ?

A Barometer

B Barograph

C Bolometer

D Callipers

View Answer

Answer: Barometer

24 Which instrument is used in submarine to see the objects above sea level ?

A Pykometer

B Polygraph

C Photometer

D Periscope

View Answer

Answer: Periscope

25 Which instrument is used to record physical happenings at a distant place ?

A Thermostat

B Tonometer

C Telemeter

D Transponder

View Answer

Answer: Telemeter

26 Which instrument is used to measure curvature of spherical objects ?

A Spectroscope

B Spherometer

C Spectrometer

D Sextant

View Answer

Answer: Spherometer

27 On a cold day when a room temperature is 15 DEGREE C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15 DEGREE C, because

A metals have higher thermal capacity than plastics

B plastics have a lower density than metals

C metals are good conductor of heat

D plastics have a higher thermal conductivity than metals

View Answer

Answer: metals are good conductor of heat

28 Identify the vector quantity from the following

A Heat

B Angular momentum

C Time

D Work

View Answer

Answer: Angular momentum

29 The rotational effect of a force on a body about an axis of rotation is described in terms of the

A Centre of gravity

B Centripetal force

C Centrifugal force

D Moment of force

View Answer

Answer: Moment of force

30 A jet engine works on the principle of conservation of

A Linear momentum

B Angular momentum

C Energy Mass

D Mass Velocity

View Answer

Answer: Linear momentum

31 With the increase of pressure, the boiling point of any substance

A Increases

B Decreases

C Remains Same

D Becomes zero

View Answer

Answer: Increases

32 Railway tracks are banked on curves

A necessary centrifugal force may be obtained from the horizontal component weight of the train

B to avoid frictional force between the tracks and wheels

C necessary centripetal force may be obtained from the horizontal component of the weight of the train

D the train may not fly off in the opposite direction

View Answer

Answer: necessary centripetal force may be obtained from the horizontal component of the weight of the train

33 Planets do not twinkle because

A they emit light of a constant intensity

B their distance from the earth does not change with time

C they are very far away from the earth resulting in decrease in intensity of light

D they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

View Answer

Answer: they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

34 Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

A at sea level

B at the top of Mt. Everest

C at a place in a valley below sea level

D in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

View Answer

Answer: at a place in a valley below sea level

35 Which are the primary Colours ?

A Yellow, Green, Blue

B Red, Magenta, Blue

C Red, Green, White

D Red, Green, Blue

View Answer

Answer: Red, Green, Blue

36 Siphon will fail to work if

A both its limbs are of unequal length

B the temperature of the liquids in the two vessels are the same

C the level of the liquid in the two vessels are at the same height

D the densities of the liquid in the two vessels are equal

View Answer

Answer: the level of the liquid in the two vessels are at the same height

37 Which of following in not a property of cathode ray.

A Cathode rays are invisible and travel in a straight line.

B These rays can ionise gases.

C These rays can penetrate through thin metal foils.

D These rays make materials cool on which they fall.

View Answer

Answer: These rays make materials cool on which they fall.

38 Radiocarbon is produced in the atmosphere as a result of

A collision between fast neutrons and nitrogen nuclei present in the atmosphere

B action of ultraviolet light from the sun on atmospheric oxygen

C action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere

D lightning discharge in atmosphere

View Answer

Answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere

39 Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

A 0.14 m/s

B 140 m/s

C 1.4 km/s

D 14 m/s

View Answer