Gravitation

Gravitation

If the distance between two masses is halved the gravitational force is:

a) Halved b) Doubled c) 4 Times d) None

Newton’s law of Gravitation states that the force of attraction between the two bodies is inversely proportional to:

a) Product of their masses b) Square of the distance between them

c) Square of the distance between their centers d) Product of mass & distance between them


The gravitational force between two bodies is:

a) Impulsive b) Reactive

c) Repulsive d) Attractive


Newton’s law of Gravitation states that the force of attraction between two bodies is directly proportional to:

a) Product of mass and distance between them b) Square of the distance between them

c) Product of their masses d) Product of square of their masses


Which force is responsible for the motion of falling bodies and the motion of planets around the sun?

a) Nuclear force b) Gravitational force

c) Electrostatic force d) Electromagnetic force


If law of gravitation is written in vector form with negative sign, then gravitational force is written as

a) Attractive force b) Repulsive force

c) Negative force d) None of these


Mass per unit volume is called:

a) Torque b) Density

c) Viscosity d) None of these


The mean density of earth is:

a) 5462 kgm-3 b) 5462 gm-3

c) 5462 kgm3 d) None of these


The radius of earth is:

a) 6400 m b) 6400 km

c) 6400 cm d) 6400 dm


It is a measure of its reluctance to change its state of motion when force is applied:

a) Mass b) Inertial mass

c) Gravitational mass d) None of the above


When a body is lifted to twice earth’s radius above the surface of the earth, the value of g decreases by:

a) Two times b) Three times

c) Six times d) Nine times


Freely falling bodies are in a state of:

a) Rest b) Static equilibrium

c) Dynamic equilibrium d) Weightlessness


What is produced by spinning the spaceship around its own axis with a certain frequency which can provide centripetal force equal to the force of gravity at that point?

a) Weightlessness b) Artificial gravity

c) Vacuum d) None of the above


A bird resting on the floor of an air tight box which is being carried by a boy, starts flying. The boy will feel that the box is now:

a) Heavier in the beginning and lighter afterwards b) Lighter

c) Shows no change in weight d) Heavier afterwards


The minimum velocity required to go out from earth’s gravitational pull is called:

a) Terminal velocity b) Angular velocity

c) Drift velocity d) Escape velocity


The force of attraction acts along the:

a) Axis of rotation b) Line joining the interacting bodies

c) Line perpendicular to the interacting bodies d) None of these


A satellite is launched from earth into orbit. What happens to the mass & weight of the satellite?

Mass Weight Mass Weight

a) Decreases Decreases b) Decreases Stays constant

c) Stays constant Decreases d) Stays constant Stays constant


According to the law of Universal Gravitation:

Every body in the universe attracts every other body

The force of attraction is directly proportional to the product of their masses

The force of attraction is inversely proportional to the square of their distance

d) All of the above


The acceleration due to gravity on moon is 1/6th of that on earth, what will be the mass of the body on moon, if its mass on earth is m:

a) m/6 b) 6m

c) m d) m/3



Two masses 10 cm apart, attract each other with a force f Newtons. When 5 cm apart of these masses will attract each other with a force (in Newtons) of:

a) f/2 b) f/4

c) 4f d) 2f


If the earth were three times farther from the sun than it is now, the gravitational force exerted on earth by the sun will be:

a) Three times b) Nine times

c) One-ninth times d) One-third times


If the mass of the earth becomes four times large, the value of ‘g’ will:

a) Remain unchanged b) Becomes four times larger

c) Be doubled d) Become sixteen times larger


The gravitational acceleration is maximum on poles as compared to that on equator because:

Distance between poles and center of earth is less as compared to that between equator & center

Distance between poles and center of earth more as compared to that between equator and center

Mass of earth on poles is greater as compared to that on equator

d) Mass of earth on poles is less as compared to that on equator


An astronaut of weight mg is moving upwards in a rocket with acceleration 4g. His apparent weight in side that rocket will be:

a) zero b) mg

c) 3 mg d) 5 mg


When a lift is moving upward with a uniform velocity, the apparent weight of a body inside the lift will be:

a) Equal to its actual weight b) Less than the actual weight

c) More than the actual weight d) Zero


Free falling bodies:

a) Have maximum weight b) Have minimum weight

c) Have no weight d) Any weight


A boy standing in a lift falling freely under gravity releases a ball from his hand. As seen by him the ball:

a) Falls down b) Remains stationary

c) Goes up d) None of the above


A satellite moves in the circle orbit at the constant speed under the action of the gravitational force of a planet. The work done on the satellite in one revolution will have magnitude:

a) Zero b) Half of the gravitational pull of the planet

c) Equal to the gravitational pull of the planet d) Proportional to the diameter of the orbit


A body in satellite orbiting round the earth is weightless because:

It is essentially a freely falling body

It is far away from the earth to experience the pull of the earth

The moon attracts the body with a force equal to its weight

d) None of the above


Artificial gravity can be created in the space craft by:

a) Revolving it around the earth b) Spinning it around its own axis

c) Increasing its velocity d) Decreasing its velocity


When a man circles round the earth in a satellite, then:

His mass becomes zero but weight remains constant

His mass remains constant but weight becomes zero

Both mass and weight remain constant

d) Both mass and weight become zero


A space ship is coming towards earth from moon at a high speed. The speed of the air ship has to be reduced. The rocket is fired to lower its speed in which direction. The rocket should be fired:

a) In the direction towards the earth b) In the direction towards the moon

c) On the right side of space ship d) On the left side of space ship


The radius of earth 6 x 106 m. What is the acceleration of a meteor, when it is 8 x 106 m from the center of the earth?

a) 8 m/s2 b) 4 m/s2

c) 9.8 m/s2 d) None of above


A man whose weight is 900 N on the earth’s surface goes to a height, which is equal to twice the earth’s radius, above the surface of the earth, then the new weight of the man will be:

a) 900 N b) 225 N

c) 300 N d) 100 N


An object is taken from the earth to a planet where the value ‘g’ is 20 m/s2, if it is compared with value of ‘g’ earth, which of the following statement is true?

a) Weight at the planet will be greater b) Weight at the planet will be same

c) Mass at the planet will be greater d) Mass at the planet will be smaller


An air craft pulls out of a drive in a circular arc of radius 1000 m at speed 200 m/s, the apparent weight of the 80 kg pilot at the lowest point will be:

a) 3990 N b) 4264 N

c) 2920 N d) 3984 N

Physics Wave Motion and Sound

Physics Wave Motion and Sound

Pick the correct option.

 According to Hooke’s law the change in the length of a spring is directly proportional to:

a) Its weight b) Applied force

c) Its temperature d) Current passing through it

 In simple Harmonic Motion the acceleration of a body is always directed towards and proportional to its displacement from:

a) Its mean position b) The point at which it is attached to the wall

c) The point at which force is applied d) None of these

 One complete round trip of a body about a mean position is called a:

a) Rotation b) Vibration

c) Period d) Frequency

The maximum displacement of a vibrating body from the equilibrium position is called:

a) Circumference b) Radius

c) Amplitude d) Oscillation

The kinetic energy of a mass attached to a spring is maximum at:

a) Mean position b) Extreme position

c) Between extreme position and mean position d) None of these

 The frequency of a second’s pendulum is:

a) 1 Hz b) 2 Hz

c) 4 Hz d)  Hz

 The waves that require a medium for their propagation are called:

a) Transverse waves b) Electromagnetic waves

c) Matter waves d) Mechanical waves

 Longitudinal waves are those in which the particles of the medium move:

a) In the direction of wave motion b) Opposite to the direction of wave motion

c) Back and forth parallel to the direction of the wave motion

d) Perpendicular to the direction of waves

 A ripple tank is used to study:

a) Nature of water b) Properties of light

c) Various features of waves d) None of these

 Water waves are not perfectly transverse and their particles move in:

a) Elliptical orbits b) Circular orbits

c) Straight lines d) Slanting lines

 The bouncing back of a wave from the boundary of two different media is known as:

a) Refraction b) Transmission

c) Diffraction d) Reflection

Physics Geometrical Optics MCQs

Physics Geometrical Optics MCQs

1. When you stand in water up to your knees, your feet appear:

a) Closer than usual

b) Further away than usual

c) At the same location as usual 

d) To answer this you must known your height and the depth of water


2. When light passes from air to glass, it:

a) Bends towards the normal without changing speed

b) Bends towards the normal and slows down

c) Bends towards the normal and speeds up

d) Bends away from the normal and slows down


3. The refractive index is:

a) Directly proportional to the wavelength of light

b) Inversely proportional to the wavelength of light

c) Directly proportional to the square of the wavelength of light

d) Inversely proportional to the square of the wavelength of light


4. A red cloth will primarily:

a) Reflect red light b) Refract red light

c) Absorb red light d) Transmit red light


5. When light passed in to rarer medium the speed and wavelength changes, which of the following statements is correct:

a) Speed increases b) Speed decreases

c) Speed increases, wavelength decreases d) Speed and wavelength both increase


6. When light enters from a rarer to a denser medium its:

a) Velocity increases b) Wavelength increases

c) Its velocity remains same d) Its frequency remains same


7. Light from the sun reaches us in nearly:

a) 8 min. b) 16 min.

c) 8 sec. d) 16 sec.


8. A lens that is thicker at the edge than it is in the middle is:

a) Converging lens b) Diverging lens

c) Angular lens d) Plain lens


9. The sign convention for virtual images is:

a) Positive b) Negative

c) Sometimes positive and sometimes negative d) All of the above


10. The angle of incidence for which angle of refraction is 90o, known as:

a) Glancing angle b) Critical angle

c) Angle of prism d) None of these


11. Which of the following is true for refraction, when light passes from one medium to other:

a) It bends away from normal b) It bends towards the normal

c) Either a) or b) d) None these


12. When white light is dispersed by a prism, one can see a series of colours. Which group of colours mentioned below is out of order:

a) Red, Yellow, Green, Blue b) Red, Yellow, Violet, Blue

c) Red, Orange, Green, Blue d) Orange, Green, Blue, Violet


13. “Mirage” is based on the phenomenon of:

a) Reflection b) Diffraction

c) Refraction d) Total internal Reflection


15. The angle of deviation for a prism is least for:

a) Violet b) Red

c) Orange d) Yellow


16. An optical fiber transmits bright light because:

a) The inside of pipe is polished

b) Of multiple reflection independent of reflection laws

c) Total internal reflection take place d) Light behaves as particles inside it

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INTRODUCTION TO PHYSICS

Introduction to Physics Multiple choice Questions 

Pick the correct answer !

1. Muslim scientists made important discoveries in the period:  a)   600 AD - 1500 AD   b)   1150 AD - 1750 AD        c)   100 AD - 800 AD    d)   500 AD - 1075 AD

2. The Muslim scientist Al-Khawarzami is famous for his work on:  a)   Physics     b)   Algebra        c)   Chemistry     d)   Medicine

3. Fundamental ideas of modern celestial mechanics were established by:  a)   Kepler & Galileo    b)   Newton        c)   Robert Hook     d)   Tycho & Halley

4. The decimal system was invented by: a)   Indians     b)   Greeks  c)   Chinese     d)   Egyptians

6. The SI unit of force is:  a)   Newton     b)   Dyne  c)   Slug      d)   Foot-pound

7. The SI unit of energy is:  a)   Joule     b)   Calorie  c)   Slug      d)   Electron volt

8. In the international system of units, the unit of mass is:  a)   Gram     b)   Kilogram  c)   Milligram     d)   Pound

9. The SI unit of Power is:  a)   Horse power     b)   Joule  c)   Calorie     d)   None of the above

10. The number of fundamental units of measurement in science is:  a)   Four      b)   Five  c)   Three     d)   Seven

11. In the SI system, there are ……. basic units. a)   Three     b)   Five  c)   Seven      d)   Nine

12. The dimensions of velocity are:  a)   [L][T]     b)   [L][T-1]  c)   [L][T-2]     d)   [L2][T-1]

13. The dimensions of work may be expressed as:  a)   [M][L]2[T]-2     b)   [M][L][T]-2  c)   [M][L][T]-1     d)   [M][L]-1[T]-1

14. The maximum possible error in the reading for a meter rod (with a least count of 1 mm) is:  a)    0.1 mm        b)   0.5 cm  c)   0.05 cm     d)   1 mm

15. The branch of science which deals with properties of matter, energy and their relationship is called  _______.  a)   Physics     b)   Chemistry  c)   Mechanics     d)   Magnetism

16. The branch of science, which deals with forces acting on bodies in motion, is called _______.  a)   Chemical Physics    b)   Mechanics  c)   Magnetism     d)   Medical Physics

17. _______ deals with structure of atom and properties of atom.  a)   Atomic Physics    b)   Nuclei Physics  c)   Mechanics     d)   None of these

18. The Islamic era (600-1500 AD) is also known as _______.  a)   Historical era     b)   Muslim period  c)   British era     d)   Greek period

19. Archimedes is also known as the founder of _______ Physics.  a)   Optical     b)   Mathematical  c)   Bio-chemical     d)   Modern

20. Kepler and _______ established the fundamental ideas of celestial mechanics. a)   Newton     b)   Faraday  c)   Galileo     d)   Thales

21. “Candela” is the unit name of quantity _______. a)   Time     b)   Intensity  c)   Mole     d)   Meter

22. The unit name of temperature is _______.  a)   Degree Kelvin    b) Candela  c  Mole   d)   Kilogram

23. “Ampere” is the unit of _______.  a)   Intensity     b)   Electric current  c)   Temperature     d)   Candela

24. The supplementary units are known as _______. a)   Derived units     b)   Small units  c)   Positive units     d)   None of these

25. The length is measured in _______.  a)   Kilometers     b)   Seconds  c)   Gram     d)   Kilogram

26. We can write one kilo = _______.  a)   104      b)   105  c)   103      d)   106

27. We can write one mega = _______.  a)   10-9      b)   1014  c)   1013      d)   106

28. The round figure of 46.55 is: a)   46.6      b)   465.5  c)   455.6     d)   None of these

29. Newton is the unit of _______.  a)   Energy     b)   Electricity  c)   Force     d)   None of these

30. The branch of physics which deals with the properties, and interaction of nuclear particles (protons  and neutrons) is called:  a)   Molecular Physics    b)   Plasma Physics  c)   Nuclear Physics    d)   Solid state Physics

31. The Physics of Islamic era ranges from  a)   3000 BC to 600 AD    b)   600 AD to 1500 AD  c)   1500 AD to 1700 AD    d) 1700 AD to 1750 AD

32. The theory of relativity was introduced (in 1905) by  a)   Planck     b)   Einstein  c)   Maxwell     d)   Rutherford

33. The fundamental Physics quantities which form the basis for the MKS system are  a)   Force, weight and time    b) Mass, length and time  c) Mass, length and force  d) Mass, energy and time

34. Fundamental units in MKS system are  a)   Gram, dyne and second   b)   Kilogram, centimeter and second   c)   Kilogram, Newton and second   d)   Kilogram, meter and second

35. The units which are based on one or more fundamental units are called  a)   Fundamental units    b)   Derived units  c)   Basic units     d)   None of the above

36. Which of the following is not a derived unit  a)   Newton     b)   Meter/sec   c)   Kilogram/meter3    d)   Second

Electrostatics MCQs

Electrostatics MCQs

Pick Right options !


1. The branch of science which deals with study of _______ charges, is called electrostatics:

a) Rest b) Move

c) Simple d) None of these


2. Like charges _______ each other:

a) Attract b) Repel

c) Contract d) None of these


3. Unlike charges _______ each other:

a) Contract b) Directly

c) Attract d) Repel


4. A substance through which an electric current can pass, is called _______:

a) Conductor b) Charge

c) Electric d) None of these


5. The conductor is a substance which contains _______ electrons:

a) Close b) Open

c) Electric d) Free


6. The substance through which an electric current cannot pass, is called _______:

a) Insulator b) Conductor

c) Plastic d) Rubber


7. The insulator is a substance which does not contain _______ electrons:

a) Close b) Open

c) Free d) Pass


8. The force of attraction or repulsion between any two charges is directly proportional to the magnitudes of the charges and _______ proportional to the square of the distance between them:

a) Inversely b) Directly

c) Equal d) Conductor






9. The value of “K” is constant and it depends upon the _______ between the charges:

a) Medium b) Force

c) Direction d) None of these
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Physics MCQs

Physics MCQs

1.             The degree of hotness or coldness of an object is expressed in terms of:                 a)   Heat capacity                                                                                b)   Heat                 c)   Temperature                                                                                 d)   Heat energy

2.             Which of the following properties of matter is used in the construction of a thermometer:                 a)   Expansion of matter on heating                          b)   Change of color with temperature                 c)   Increase of resistance with rise of temperature                      d)   All of these

3.             Mercury is used in mercury-in-glass thermometer as a thermometric substance because:                 a)   It does not wet the capillary tube walls                    b)   It is opaque                  c)   Its expansion is uniform over a wide range of temperature                 d)   All of above

4.             Two fixed points used for the temperature scales are:                 a)   The temperature of freezing and boiling mercury                 b)   The temperature of melting ice and boiling water                 c)   The temperature of water at 0oC and 100oC       d)   None of these

5.             In liquid-in-glass thermometer, the thermometric property used is:                 a)   Thermal expansion                                                      b)   Color change on heating                 c)   Resistance change on heating                                    d)   None of these

6.             The lower and upper fixed points on Celsius (centigrade) scale are taken to be:                 a)   0o and 212o                                                                    b)   32o and 273o                         c)   0o and 100o                                                                     d)   None of these

7.             A Celsius (centigrade) degree is greater than a Fahrenheit degree by:                 a)   5/9                                                                                   b)   9/5                 c)   18/5                                                                                 d)   9/10

8.             The Centigrade and Fahrenheit scales have the same reading at:                 a)   40o                                                                                   b)   140o                 c)   -140o                                                                                d)   -40o

9.             The relationship between Celsius and Fahrenheit scales temperature is:                 a)   Fo = 9/5 Co - 32                                                              b)   Fo = 9/5 Co + 32                 c)   Co = 9/5 Fo + 32                                                            d)   None of these

10.          The temperature of a normal human body is 98.6 Fo. This temperature corresponds to:                 a)   20 Co                                                                               b)   30 Co                 c)   37 Co                                                                                d)   66.6 Co

11.          The temperature of normal human body is 37 Co. On Kelvin scale, it is equal to:                 a)   373 Ko                                                                             b)   273 Ko                 c)   310 Ko                                                                             d)   236 Ko

12.          One degree of centigrade scale is equal to:                 a)   1o of Fahrenheit                                                            b)   1.8o of Fahrenheit                         c)   32o of Fahrenheit                                                          d)   3o of Fahrenheit

13.          10 Co corresponds to:                 a)   273o K                                                                             b)   283o K                c)   263o  K                                                                             d)   100o K

14.          The temperature of absolute zero corresponds to:                 a)   -273 Co                                                                            b)   273 Co                  c)   0 Co                                                                                  d)   20 Co

15.          What temperature on Fahrenheit scale corresponds to absolute zero?                 a)   212o F                                                                              b)   32o F                 c)   -32o F                                                                               d)   -460o F

16.          One Calorie is equal to:                 a)   41.8 J                                                                               b)   4.18 J                c)   18.4 J                                                                               d)   4.35 J

17.          SI unit of heat energy is:                 a)   Calorie                                                                            b)   B.T.U.                 c)   Joule                                                                            d)   Kilo-Calorie

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