Physics Study Material बिभाग ‘क’ Shared By R. Agarwal

Physics Study Material बिभाग ‘क’ on mahasarkar.co.in. This is the page where we are deal with Physics Study Material For Maharashtra Recruitment Exam. Every questions come from various source i.e. Mechanics and Properties Matter; Heat; Wave Motion; Electromagnetic Radiation; Light; Sound; Magnetism; Static Electricity; Current Electricity; Atomic Physics; Nuclear Physics; Astronomy and Space; Computer Science; and General. यह पेज ओह सब स्टूडेंट के लिए है, जो नौकरी की तलाश में हैं और भारती परिक्षा दिने के लिए इच्छुक हैं।

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Study Material: Physics बिभाग ‘क’

1. The universal law of gravitation was propounded by

(1) Kepler

(2) Galileo

(3) Newton

(4) Copernicus

Ans:- (3) Newton

2. The gravitational force with which the sun attracts the earth

(1) Is less than the force with which the earth attracts the sun

(2) Is the same as the force with which earth attracts the sun

(3) Is the more than the force with which the earth attracts the sun

(4) Is constant throughout the year

Ans:- 2) Is the same as the force with which earth attracts the sun

3. The mass of a body is different from its weight because

(1) Mass is a variable quantity whereas weight is constant

(2) Mass varies very little at different places whereas weight varies a lot

(3) Mass is constant but weight increases as the body moves from the poles to the equator

(4) Mass is a measure of the quantity of matter whereas weight is a force

Ans:- (4) Mass is a measure of the quantity of matter whereas weight is a force

5. A body weight slightly more at the poles than at the equator

(1) The earth is flat at the poles

(2) The earth has the maximum speed of rotation at the equator

(3) The attractive force at the poles increases due to the ice cap

(4) None of these is a complete explanation

Ans:- (4) None of these is a complete explanation

6. If a body is taken from the earth to the moon

(1) Its mass will be different but weight will remain the same

(2) Both mass and weight will be different

(3) its mass will remain the same but weight will be different

(4) Its mass and weight will remain unchanged

Ans:- (3) its mass will remain the same but weight will be different

7. A ball tied with a string to a rotating shaft unchanged at uniform speed. As the shaft is suddenly brought to rest the string getting round the shaft with the angular velocity of the ball.

(1) Increasing

(2) Decreasing

(3) Remaining constant

(4) Becoming zero

Ans:- (1) Increasing

8. One finds it more difficult to walk on ice than on a concrete road because

(1) Ice is soft and spongy whereas concrete is hard

(2) The friction between the ice feet is less than between the concrete and the feet

(3) There is more friction on than on concrete

(4) None of these

Ans:- (2) The friction between the ice feet is less than between the concrete and the feet

9. A sheet of paper can be pulled out quickly from under a glass of water without spilling the water. This phenomenon illustrates

(1) Lack of friction between paper and glass

(2) Newton’s third law of motion

(3) Inertia

(4) Acceleration

Ans:- (3) Inertia

10. A long thread suspended from a fixed point, has a small mass swinging to and fro at its lower end.

(1) The potential energy of the mass is maximum in the middle of the swing

(2) The kinetic energy is maximum in the middle of the swing.

(3) The potential energy is always equal to the kinetic energy.

(4) The sum of the potential energy and the kinetic energy is maximum in the middle of the swing.

Ans:- (2) The kinetic energy is maximum in the middle of the swing.

11. If an apple is released from an orbiting spaceship, it will

(1) Fall towards the earth

(2) Move along with the spaceship at the same speed

(3) move at a higher speed

(4) move at a lower speed

Ans:- (2) Move along with the spaceship at the same speed

12. A steel ball floats on mercury because

(1) Mercury does not allow any metallic ball to sink, in it.

(2) Mercury is also a metal in the liquid form

(3) The density of, mercury is higher, is higher than that of steel

(3) A steel ball can be made to float on any liquid by suitable adjustment

Ans:- (3) The density of, mercury is higher, is higher than that of steel

13. Inside an aeroplane, flying at a high altitude

(1) The pressure is the same as that outside

(2) Normal atmospheric pressure is maintained by the use of air pumps

(3) The pressure inside is less than the pressure outside

(4) Normal humidity and partial vacuum are maintained

Ans:- (2) Normal atmospheric pressure is maintained by the use of air pumps

14. The atmosphere exerts enormous pressure on us. But we do not feel it because

(1) We are used to it

(2) Our bones are very strong and can withstand this pressure

(3) The surface area of our head is very small

(4) Our bold exerts a preferred slightly more than that of the atmosphere

Ans:- (4) Our bold exerts a preferred slightly more than that of the atmosphere

15. In a barometer, mercury is preferred over water because

(1) Mercury is a good conductor of heat

(2) Mercury is shining and therefore its level can be read easily

(3) Mercury is available in pure form

(4) Mercury has high density and low vapour pressure

Ans:- (4) Mercury has high density and low vapour pressure

16. Four solid cubes of different metals, each one having a mass of one kg, are weighed in water

(1) All cubes weight equal

(2) Cube with minimum density weighs minimum

(3) Cube with minimum density weighs maximum

(4) None of these is correct

Ans:- (2) Cube with minimum density weighs minimum

17. A stone is thrown into a deep Lake. As it sinks deeper and deeper into the water, the upthrust acting on it.

(1) Increases

(2) Decreases

(3) First decreases then increases

(4) Remains constant

Ans:- (4) Remains constant

18. When two mercury drop[s are brought into contact, they merge to form a bigger drop because liquids have a tendency to possess

(1) Minimum volume

(2) Maximum surface area

(3) Minimum surface area

(4) Maximum volume

Ans:- (3) Minimum surface area

19. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

(1) Mercury is a metal

(2) Density of mercury is greater than that of water

(3) Cohesion of mercury is greater than its adhesion with glass

(4) Cohesion of water is greater than its adhesion with glass

Ans:- (3) Cohesion of mercury is greater than its adhesion with glass

20.The swing of a spinning cricket ball in the air can be explained on the basic of

(1) Sudden change in wind direction

(2) Buoyancy of air

(3) Turbulence caused by wind

(4) Bernoulli’s theorem

Ans:- (4) Bernoulli’s theorem

21. A train goes past a railways station at a high speed. A young boy standing on the edge of the platform is likely to

(1) Remain unaffected

(2) Fall away from the train

(3) fall towards the train

(4) fall away from or towards the train depending on its aped.

Ans:- (3) fall towards the train

22. In cold countries alcohol is preferred to mercury as a thermometric liquid because

(1) Alcohol is a better conductor of heat

(2) Alcohol can be colored and its level seen easily

(3) Alcohol has a very low freezing mercury

(4) Alcohol is cheaper than mercury

Ans:- (3) Alcohol has a very low freezing mercury

23. When a certain mass of liquid as heated in a glass flask

(1) The density of the liquid remains unchanged

(2) The density of the liquid increases

(3) The liquid level starts rising at once

(4) The liquid level falls first and then starts rising

Ans:- (4) The liquid level falls first and then starts rising

24. When a cube of ice floating on water in a beaker melts, the level of water in the beaker

(1) rises

(2) falls

(3) remains the same

(4) first rises and then falls

Ans:- (3) remains the same

25. What happens when water is cooled from 8⁰C to 0⁰C?

(1) Its volume decreases uniformly, becoming minimum at 0⁰C.

(2) Its density increases uniformly, attaining maximum value at 0⁰C.

(3) Its volume decreases up to 4⁰ C and then increases.

(4) Its density decreases up to 4⁰C and then increases.

Ans:- (3) Its volume decreases up to 4⁰ C and then increases.

26. An iron hammer, lying in the sun, appears much hotter than its wooden handle because

(1) Iron is at higher temperature

(2) Iron is darker than wood

(3) Iron absorbs more heat

(4) Iron is a good conductor of heat

Ans:- (4) Iron is a good conductor of heat

27. Using the codes GH for for good conductor of heat, BH for bad conductor of heat, GE for good conductor of electricity and BE for bad conductor of electricity, mica can be classified as:

(1) GH and GE

(2) GH and BE

(3) BH and GE

(4) BH and BH

Ans:- (2) GH and BE

28. Woodllens keep us warm in winter because they

(1) Produce more warmth

(2) Are good absorbers of heat

(3) Do not allow our body heat to escape

(4) Do not allow cool air to enter

Ans:- (3) Do not allow our body heat to escape

29. By what Process is heat transmitted from the filament of an evacuated electric bulb to the glass?

(1) Conduction

(2) Convection

(3) Radiation

(4) Radiation Heat cannot be transmitted through va-cuum

Ans:- (3) Radiation

30. Hot coffee is poured simultaneously in four metallic tumblers painted outside with different types of paints. After some time, the coffee will be found coldest in the tumbler painted

(1) Rough white

(2) Shining white

(3) Rough black

(4) Shining black

Ans:- (3) Rough black

31. By which of the following methods could a cup of hot coffee lose heat if placed on a metal table in a room?

(1) Conduction and radiation

(2) Conduction and convection

(3) Convection and radiation

(4) Conduction, convection, radiation and evaporation

Ans:- (4) Conduction, convection, radiation and evaporation

32. Drinks remain hot or cold for a long time in a thermos flask because of the

(1) Presence of air, which is a bad con-ductor of  heat, in between the double walls

(2) Silver coating on the inside of the double walls

(3) Vacuum between the double walls

(4) Combined effects of (b) and (c)

Ans:- (4) Combined effects of (b) and (c)

33. A little ether on the palm gives a cooling sensation because ether

(1) is a cold liquid

(2) Evaporates

(3) Enters the pores of the skin

(4) Condenses on the palm

Ans:- (2) Evaporates

34. During summer, we feel comfortable under5 a fan because it.

(1) Throws cool air on us

(2) sets the air in motion, thereby increasing the evaporation of sweat

(3) Produces convection currents

(4) Produces air which carries heat away from the body

Ans:- (2) sets the air in motion, thereby increasing the evaporation of sweat

35. Scalding with steam is more severe than scalding by boiling water because

(1) Steam can penetrate the skin

(2) Steam is at a higher temperature

(3) Steam contains more energy than boiling water

(4) Steam is at a higher pressure

Ans:- (3) Steam contains more energy than boiling water

36. One feels cold after a dip in sea water due to

(1) Convection currents

(2) The deposition of salt on the body

(3) The evaporation of water on the body

(4) The difference in temperatures between land and sea

Ans:- (3) The evaporation of water on the body

37. The quantity of water vapor the atmosphere can hold

(1) Is independent of temperature

(2) Increases with increase of temperature

(3) Decreases with increase of temperature

(4) Fluctuates with increase of temperature

Ans:- (2) Increases with increase of temperature

38. It takes much longer to cook things in the hills than in the plains, because

(1) Due to low atmospheric pressure in the hills the boiling point water is raised, and therefore water takes longer to boil.

(2) In the hills the atmospheric pressure is lower than that the plains and therefore water boils at lower temperature.

(3) In the hills the atmospheric temperature is low and therefore a lot of heat is lost to the atmosphere

(4) In the hills the humid atmosphere absorbs a lot of heat, leaving very little for the cooking

Ans:- (2) In the hills the atmospheric pressure is lower than that the plains and therefore water boils at lower temperature.

39. The cover of a solar cooker is made of glass

(1) Because glass allows sunlight into the container but does not allow heat radiation out of it

(2) Because glass is transparent and one can see the food cooking

(3) Because glass does not absorb heat radiation and, therefore, there is no wastage of energy

(4) Because glass is a good conductor of heat and is also vheap

Ans:- (1) Because glass allows sunlight into the container but does not allow heat radiation out of it

40. Light waves are different from sound waves in that

(1) light waves are electromagnetic but sound waves are not

(2) light waves can travel through water but sound waves cannot

(3) Light travels with the same speed in all media

(4) Light waves produce interference but sound waves do not

Ans:- (3) Light travels with the same speed in all media

41.Why does radio reception improve slightly during the night?

(1) The outside noise is reduced very much at night

(2) Unlike the daytime, only a few radio stations broadcast during the night

(3) Sunlight affects radio broadcasts to some extent during the day

(4) The magnetic field of the earth acts with reduced intensity during the night, thereby reducing its impact on broadcasts.

Ans:- (4) The magnetic field of the earth acts with reduced intensity during the night, thereby reducing its impact on broadcasts.

42. Television signals cannot be received ordinarily beyond a particular distance due to

(1) Weakness of the signals

(2) Weak antenna

(3) Absorption of signals in the air

(4) Curvature of the earth

Ans:- (4) Curvature of the earth

43. Planets are

(1) Luminous bodies that twinkle

(2) Non-luminous bodies that twinkle

(3) Luminous bodies that do not twinkle

(4) Non-luminous bodies that do not twinkle

Ans:- (3) Luminous bodies that do not twinkle

44. A lunar eclipse occurs when

(1) The sun, the moon and the earth are not in the same line

(2) The moon comes between the sun and the earth

(3) The earth comes between the sun and the moon

(4) The sun comes between the earth and the moon

Ans:- (3) The earth comes between the sun and the moon

45. A solar eclipse occurs when

(1) The moon comes between the sun the earth

(2) The earth comes between the sun and the moon

(3) The sun comes between the  earth and the moon

(4) The sun, the moon and the earth are not in the same line

Ans:- (1) The moon comes between the sun the earth

46.The minimum length of a plane mirror in which a person can see himself full length should be

(1) Equal to the person’s height

(2) Slightly more than his height

(3) Nearly half his height

(4) Nearly one-fourth his height

Ans:- (3) Nearly half his height

47. If you stand in a room, where two adjacent walls are covered with plane mirrors, the total number of your images formed will be

(1) 2

(2) 3

(3) 4

(4) Infinite

Ans:- (2) 3

48. What type of mirror can be used to obtain the real image of an object?

(1) Plane mirror

(2) Concave mirror

(3) Convex mirror

(4) Convex mirror

Ans:- (2) Concave mirror

49. For the rear view, motorists use

(1) Plane mirror

(2) Concave mirror

(3) Convex mirror

(4) Cylindrical mirror

Ans:- (3) Convex mirror

50. Assertion: A pool of water looks shallower than it actually is:

Reason: Light bends towards the normal while travelling from water to air

(1) Both A and R correct, and R explains A

(2) Both A and R correct, but R does not explain A

(3) A is right , R is wrong

(4) A is wrong, R is right

Ans:- (3) A is right , R is wrong