1000+ General Physics MCQ for SSC CGL [Solved]

1. Frictional force acts in
A. the same direction as the motion
B. the opposite direction of the motion
C. all the directions
D. upward direction
Answer : B

2. The sun continuously produces an enormous amount of energy. This la due to
A. nuclear fission
B. nuclear fusion
C. chemical combustion
D. boiling
Answer : B

3. A person does not sink in the Dead Sea because
A. the sea contains a large amount of other salts besides sodium chloride
B. the density of the person is less than the density of the Dead Sea water
C. of the surface tension due to salt water in the Dead Sea
D. of difference in mass
Answer : B

4. At what temperature do the Fahrenheit and Kelvin scales give the same reading?
A. 212°
B. 32°
C. -40°
D. 0°
Answer : D

5. In a microphone
A. sound energy is converted into electrical energy
B. electrical energy is converted into sound energy
C. sound energy is converted into mechanical energy
D. mechanical energy is converted into sound energy
Answer : A

6. The planet that moves fastest around the sun is
A. Mars
B. Venus
C. Earth
D. Mercury
Answer : D

7. Echoes are produced by
A. the reflection of sound waves
B. the refraction of sound waves
C. the interference of sound waves
D. reverberation of sound waves
Answer : A

8. Body A is kept in contact with body B. Heat will flow from A to B if
A. the heat content of A is greater than that of B
B. the temperature of A is greater than that of B
C. the specific heat of A is greater than that of B
D. the specific heat of B is greater than that of A
Answer : B

9. A permanent magnet may be demagnetised by
A. placing it inside a solenoid through which an alternating current is flowing
B. heating the magnet to redness and then allowing it to cool
C. dropping it several times or hammering it while lying east-west
D. All the above
Answer : D

10. The strength of an electromagnet can be increased by
A. increasing the length of the coiled wire
B. increasing current supply
C. increasing the size of the iron core
D. All the above
Answer : D

11. When a particle in motion is acted upon by a force in a direction perpendicular to the direction of motion, the path followed by the particle will be
A. a straight line
B. an ellipse
C. a circle
D. a parabola
Answer : D

12. When an electric apparatus is fitted with a three core flexible lead the insulation on the three wires is distinctively coloured. The present international convention is
A. brown for earth, yellow for live, light blue for neutral
B. green for earth, yellow for live, brown for neutral
C. yellow for earth, green for live, brown for neutral
D. brown or red for live, light blue or black for neutral and green or yellow for earth
Answer : D

13. Moon has no atmosphere because
A. it has no population
B. it is quite far off
C. its surface is full of rocks
D. its gravity is not sufficient for any atmosphere to hold on to it
Answer : D

14. When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy in the form of electromagnetic wave pulses called
A. neutrons
B. electrons
C. phonons
D. photons
Answer : D

15. The force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of distance between them. This was propounded by
A. Coulomb
B. Gilbert
C. Volta
D. Rutherford
Answer : A

16. The mixing up of two gases as a result of random motion of molecules is called
A. diffusion
B. effusion
C. vaporisation
D. sublimation
Answer : A

17. A tube light works on the principle of
A. chemical, heating and magnetic effects of electricity
B. discharge of electricity through gases
C. the action of ultraviolet radiation on certain fluorescent materials
D. Both (b) and (c) above
Answer : D

18. The function of a ruse wire is
A. to stabilise the voltage
B. to decrease the current supply
C. to increase the current supply
D. to prevent an unduly high current from passing through a circuit
Answer : D

19. The temperature, surface features, length of days and nights of a planet depend on
A. its atmosphere
B. its distance from the sun
C. its rotation
D. All the above
Answer : D

20. Who first established the fact that the earth revolves round the sun?
A. Sir Isaac Newton
B. Kepler
C. Copernicus
D. Ptolemy
Answer : C

21. Commonly used safety fuse wire is made of
A. Tin
B. Lead
C. Nickel
D. An alloy of tin and lead
Answer : D

22. Mercury does not stick to glass because
A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces
C. both the cohesive and adhesive forces are equal
D. None of the above
Answer : A

23. When an electric bulb breaks, there la an explosive sound. That is due to
A. the chemical reaction between the gases inside the bulb
B. the compressed gases inside rushing out suddenly
C. the air outside rushing in to fill the vacuum inside the bulb
D. None of the above
Answer : C

24. Cosmic rays are
A. powerful X-rays falling on the earth from space
B. ultraviolet rays from the sun
C. gamma rays from radioactive minerals
D. very energetic radiation falling upon the earth from outer space consisting chiefly of charged particles
Answer : D

25. The following are the atmospheric zones above the surface of the earth:
A) Troposphere
B) Ionosphere
C) Stratosphere
D) Exosphere
Select the correct sequence from the earth's surface on the basis of the codes given below:
A. ACBD
B. ABCD
C. CABD
D. BACD
Answer : A

26. Raindrops assume a spherical shape because or
A. adhesion
B. surface tension
C. gravitational force
D. atmospheric pressure from all sides
Answer : B

27. In the nucleus of an atom, the uncharged particle is
A. proton
B. neutron
C. electron
D. positron
Answer : B

28. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
A. rough white
B. rough black
C. shining white
D. shining black
Answer : B

29. When ice melts, Its volume
A. decreases
B. increases
C. remains the same until all the ice has melted and then increases
D. remains the same
Answer : A

30. A piece of ice is Boating In water kept in a beaker. When all the ice melts the level of water will
A. first rise and then fall
B. fall
C. remain the same
D. rise
Answer : C

31. Two tumblers stuck together can be separated by
A. pouring ice cold water into the inner tumbler
B. pouring ice cold water on the outer tumbler
C. pouring hot water into the inner tumbler
D. dipping both the tumblers in hot water
Answer : A

32. Mercury is used in a barometer because
A. its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
B. at the ordinary temperature its vapour pressure is small
C. it is opaque and does not wet glass
D. All the above
Answer : D

33. The speed of sound in a medium depends upon the properties of the medium such as
A. its density
B. its temperature
C. its elasticity
D. All the above
Answer : D

34. The Space Application Centre for training in Satellite Communication Technology is located at
A. Bangalore
B. Mumbai
C. Ahmedabad
D. New Delhi
Answer : C

35. The colour or an opaque object is due to the colour it
A. absorbs
B. refracts
C. reflects
D. scatters
Answer : C

36. A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure
A. is found by measuring the slanting height of the mercury column
B. is given by the vertical height
C. cannot be measured with it
D. can be measured by both the methods described above
Answer : B

37. Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because
A. the speed with which it escapes cools it down
B. of the higher temperature of the surroundings
C. of sudden expansion causing loss of internal energy
D. there is no real fall in temperature
Answer : C

38. Rain drops acquire spherical shape due to
A. viscosity
B. surface tension
C. friction
D. elasticity
Answer : B

39. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
A. the immersed volume of the body
B. density of the liquid
C. acceleration due to the gravity at the place
D. All the above
Answer : D

40. A ship sailing from a river to the sea
A. sinks less in the sea
B. sinks more in the sea
C. neither sinks more nor less in the sea
D. sinking more or less depends on sea
Answer : A

41. The maximum range of most TV signals is from 121 to 240 km only because
A. the curvature of earth limits the range of reception
B. the signals are weak
C. the signals are absorbed by air
D. the antennae are not powerful enough
Answer : A

42. A piece of cork la embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
A. It will go down
B. It will come up
C. It will remain at the same level
D. First it will go down and it will come up
Answer : C

43. The force that keeps a body in a circular motion is called
A. the centripetal force
B. the centrifugal force
C. the frictional force
D. All the above
Answer : A

44. A person does not sink in the Dead Sea because
A. the sea contains a large amount of other salts besides sodium chloride
B. the density of the person is less than the density of the Dead Sea water
C. of the surface tension due to salt water in the Dead Sea
D. of difference in mass
Answer : B

45. The unit of heat energy is
A. watt
B. degree
C. joule
D. erg
Answer : C

46. Electron-volt is a unit of
A. power
B. velocity
C. energy widely used in nuclear physics
D. number of electrons
Answer : C

47. Dioptre is the unit of power of
A. convex mirrors
B. concave mirrors
C. concave lenses
D. lenses irrespective of types
Answer : D

48. A small bubble of air deep down in a lake rises up to the top of the lake. The volume of the bubble on coming up will
A. increase
B. decrease
C. will not change
D. first increase and then decrease
Answer : A

49. The brightest planet in the Solar System is
A. Jupiter
B. Mercury
C. Venus
D. Sirius
Answer : C

50. The Milky Way is
A. the path of a star which is nearest to the earth
B. a galaxy which includes the sun
C. a star that is nearest to the earth
D. None of these
Answer : B