Physics Test 31

Total Questions: 25

1 - Aviation fuel for jet aeroplanes consists of purified:

A ) Petrol
B ) Kerosene ✅
C ) Gasoline
D ) Diesel

2 - A silver spoon and a book are both at room temperature. The spoon feels colder to the touch because:

A ) Of an illusory effect
B ) Silver is an almost pure material
C ) Silver is a very good heat conductor ✅
D ) It is made of a denser material

3 - A liquid rises in a syringe when it's piston is pulled up because:

A ) Of the property of surface tension
B ) Of capillary action
C ) Of the action of atmosphere pressure ✅
D ) There is a force of cohesion between the liquid molecules and the glass syringe

4 - A small weight is put on the pressure cooker. It increases the pressure of the steam because:

A ) The weight is proportionate to the steam required
B ) Area of contact is small ✅
C ) The weight stops the steam from escaping
D ) Of Bernoulli's principle

5 - When an electric bulb breaks, there is a mild bang due to:

A ) The chemical reaction between the enclosed gases
B ) The compressed gases rushing out suddenly
C ) The air rushing in to fill the evacuated space ✅
D ) None of these

6 - A bomb is dropped at a point from a moving aeroplane. The pilot observes that:

A ) The bomb traverses a curved path and falls some distance behind that point
B ) The bomb traverses a curved path and falls some distance ahead ✅
C ) The bomb drops vertically downward
D ) The bomb remains stationary in the air for sometime

7 - When light passes from air into glass it experiences change in:

A ) Frequency and wavelength
B ) Frequency and speed
C ) Wavelength and speed ✅
D ) Frequency , wavelength and speed

8 - A person sitting in an open car moving at constant velocity throws a ball vertically upwards in air. If effect of air resistance is neglected,the ball will fall:

A ) Exactly in hands of the person ✅
B ) Outside the cars
C ) In the car behind the person
D ) In the car ahead of the person

9 - The difference between a nuclear reactor and an atomic bomb is that:

A ) No chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction
B ) No chain reaction takes place in atomic bomb while it takes place in nuclear reactor
C ) The chain reaction in nuclear reactor is controlled ✅
D ) The chain reaction in nuclear reactor is not controlled

10 - One should not connect a number of electric appliances to the same power socket because:

A ) The appliances will not get full voltage
B ) The appliances will not get proper current
C ) This can damage the appliances
D ) This can damage the domestic wiring due to overheating ✅

11 - A ship rises as it enters the sea from a river because the:

A ) Water in sea is hard water
B ) Larger quantity of water in the sea pushes the ship upward
C ) Density of sea water is lower than that of the river water
D ) Density of sea water is higher than that of the river water ✅

12 - When a vehicle passes, TV reception gets distorted. This is because:

A ) Metal reflects radiowaves
B ) Spark plug creates electromagnetic disturbances ✅
C ) Passing vehicle affects the sophisticated TV components
D ) Modern vehicles use electronic ignition system

13 - Tiredness is felt on the top of the mountains because of:

A ) High temperature
B ) Low temperature
C ) High pressure outside the body
D ) Low pressure outside the body ✅

14 - Why is a cyclist required to bend inwards while moving in a circular path?

A ) To keep the vehicle on the road
B ) To make the centre of gravity falls with the base
C ) To produce the necessary centripetal force required to keep him moving in a curved path ✅
D ) None of these

15 - Heat received by earth from the Sun is known as

A ) Insulation
B ) Solar radiation ✅
C ) Solar heat
D ) Thermal radiation

16 - Special theory of relativity was proposed by

A ) Issac Newton
B ) Albert Einstein ✅
C ) Galilee
D ) Robert Hook

17 - Isaac Newton gave

A ) Law of Planetary Motion
B ) Laws of Motion and Laws of Gravitation ✅
C ) Law of Geometry
D ) None of these

18 - The celebrated scientist Issac Newton was

A ) British ✅
B ) Dutch
C ) Italian
D ) French

19 - Mechanics is the study of

A ) Forces acting on bodies ✅
B ) Movement of bodies
C ) Angle of bodies ✅
D ) Shape of bodies

20 - Sodium chloride is commonly called as

A ) Washing soda
B ) Gypsum ✅
C ) Common salt
D ) Plaster of Paris

21 - Dynamic is the study of

A ) Movements of earth
B ) Movement of bodies ✅
C ) Angles of bodies
D ) Forces acting on bodies

22 - Which instrument is used to measure very high temperature?

A ) Tachometer ✅
B ) Pyrometer
C ) Udometer
D ) Lactometer

23 - Which of the following layer of atmosphere make radio transmission possible?

A ) Ionosphere ✅
B ) Troposphere
C ) Hydrosphere
D ) Stratosphere

24 - What is the speed of sound in dry air?

A ) 500 km/s
B ) 550 km/s ✅
C ) 610 km/s
D ) 710 km/s

25 - Which instrument is used to measure minute electrical currents?

A ) Seismograph
B ) Polygraph
C ) Manometer
D ) Galvanometer ✅