## general science

### Physics MCQ Questions and Answers Page - 8

1.
 In the absence of the earth’s atmosphere, sky would appear A Blue B Deep red C White D Black Answer : D Explanation :
2.
 Which one of the following processes is responsible for the glittering of air bubble rising through water  ? A Reflection of light B Refraction of light C Total internal reflection of light D Scattering of light Answer : C Explanation :
3.
 The colour of the ocean appears to be blue because the sunlight falling on it is A Reflected B Refracted C Diffracted D Scattered Answer : D Explanation :
4.
 When we see an object, the image formed on the retina is A Real and inverted B Real and erect C Virtual and erect D Virtual and inverted Answer : A Explanation :
5.
 Person who is colour-blind cannot distinguish between A Black and yellow B Red and green C Yellow and white D Green and blue Answer : B Explanation :
6.
 Which of the following waves cannot be polarised  ? A Radio B Ultra violet C Infrared D Ultrasonic Answer : D Explanation :
7.
 The lens of the eye is behind the  : A Pupil B Vitreous human C Retina D Optic nerve Answer : A Explanation :
8.
 After a shower of rain, a rain bow is seen  : A Towards the sun B Opposite the sun C Even in the absence of the sun D Anywhere, irrespective of the position of the sun Answer : B Explanation :
9.
 A person suffering from long sightedness wears spectacles having  : A Concave convex lens B Lenses with negative C Concave lenses D Convex lenses Answer : D Explanation :
10.
 Distant objects can be seen with the help of  ? A Chronometer B Telescope C Microscope D Spectroscope Answer : B Explanation :
11.
 Which of the following phenomena is involved in Kaleidoscope  ? A Refraction B Reflection C Total internal reflection D Diffraction Answer : B Explanation :
12.
 In a magnifying glass  _____________  lens is used. A Convex B Concave C Plano concave D Plano convex Answer : A Explanation :
13.
 Why does a black board appears black in colour  ? A It reflects black colour B It absorbs black colour C It reflects all colours D It absorbs all the colours Answer : D Explanation :
14.
 Which one of the following is not a property of electromagnetic waves  ? A Electromagnetic waves do not show interference and diffraction. B Oscillating electric field and magnetic field are perpendicular to each other. C Electromagnetic waves are transverse waves D Electromagnetic waves do not require a medium to propagate. Answer : A Explanation :
15.
 Convex mirror is generally used in  __________ . A Solar cookers B Ophthalmoscope C Reflector for head light D Rear view mirror Answer : D Explanation :
16.
 If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used  ? A Concave B Convex C Cylindrical D Plane Answer : A Explanation :
17.
 Why does water tank appear shallower when viewed from the top  ? A Due to reflection B Due to refraction C Due to diffraction D Due to total internal reflection Answer : B Explanation :
18.
 Which colour is formed when Red and Green are mixed  ? A Light blue B Yellow C White D Grey Answer : B Explanation :
19.
 Which phenomena shows the particle nature of light  ? A Diffraction B Interference C Photoelectric effect D Polarisation Answer : C Explanation :
20.
 What is the value of the Least Distance of Distinct vision (in cm) for a normal human being ? A 2.5 B 25 C 58 D 60 Answer : B Explanation :
21.
 When light passes from one medium to another, this phenomenon of change in its direction is called  _____________ . A Refraction B Diffraction C Propagation D No option is correct Answer : A Explanation :
22.
 The side mirrors of vehicles are of which type of mirrors  ? A Convex B Concave C Plane D Inverted Answer : A Explanation :
23.
 An image formed by a concave mirror on a screen is called A Virtual image B Real image C Inverted image D Erect image Answer : B Explanation :
24.
 The light is composed of small particles, called  ____________ . A Proton B Electron C Photon D Alpha Particle Answer : C Explanation :
25.
 Which among the following is most helpful in energy savings  ? A Incandescent bulb B Fluorescent tube light C Compact fluorescent lamp D LED bulb Answer : D Explanation :
26.
 Which mirror is used by doctors for examining eyes, ears, nose and throat  ? A Concave mirror B Convex mirror C Normal mirror D Plane mirror Answer : A Explanation :
27.
 Ability to distinguish two closely placed objects is A Resolving power B Video power C Distinguish power D Magnifying power Answer : A Explanation :
28.
 What are the objects like sun that give out or emit light of their own called  ? A Glittering objects B Luminous objects C Shiny objects D Sparkling objects Answer : B Explanation :
29.
 In which of the following mirror size of image formed is always equal to the size of object ? A Convex mirror B Concave mirror C Plane mirror D Both convex and concave mirror Answer : C Explanation :
30.
 Which of the following term does  NOT  represent electrical power in circuit  ? A $I^{2}R$ B $IR^{2}$ C $VI$ D $\frac{V^{2}}{R}$ Answer : B Explanation :
31.
 What is/are the cause(s) of arise hypermetropia  ? A Excessive curvature of the eye lens B Elongation of the eye ball C Focal length of the eye lens is too long D No option is correct Answer : C Explanation :
32.
 In which mirror, image formed is virtual, erect and point sized  ? A Plane B Convex C Concave D No option is correct Answer : B Explanation :
33.
 Which of the following controls the size of pupil in human eye  ? A Cornea B Iris C Aqueous humour D Retina Answer : B Explanation :
34.
 In a concave mirror if object is placed at centre of curvature, then image will be  ____________ . A Virtual B Erect C Diminished D At the centre of curvature Answer : D Explanation :
35.
 What is the cause of arise of myopia  ? A Excessive curvature of the eye lens B Eye ball becomes too small C Focal length of the eye lens becomes too long D Lack of sleep Answer : A Explanation :
36.
 The splitting of while light into its component colours is called  ____________ . A Diffraction B Refraction C Dispersion D Scattering Answer : C Explanation :
37.
 The human eye forms the image of an object at its  _____________ . A Cornea B Iris C Pupil D Retina Answer : D Explanation :
38.
 Light waves are  ____________ . A Electric waves B Magnetic waves C Electromagnetic waves D No option is correct Answer : C Explanation :
39.
 What kind of mirror would be best suited for use in a solar cooker  ? A Concave B Convex C Plane D No option is correct Answer : A Explanation :
40.
 The change in focal length of an eye lens is caused by the action of the  ____________ . A Pupil B Retina C Ciliary muscle D Iris Answer : C Explanation :
41.
 Which of the following controls the amount of light entering the eye  ? A Iris B Cornea C Aqueous humour D Crystalline lens Answer : A Explanation :
42.
 Which of the following lens always forms a virtual, erect and diminished image  ? A Convex B Concave C Both convex and concave D None of these Answer : A Explanation :
43.
 A person having hypermetropia has to keep a reading material at what distance (in cm) for comfortable reading  ? A 22 B 25 C 35 D 45 Answer : B Explanation :
44.
 A person with hypermetropia  ____________ . A Cannot see nearby objects clearly B Cannot see distant objects clearly C Cannot see both nearby and distant objects clearly D No option is correct Answer : A Explanation :
45.
 The eye lens forms which type of image on retina  ? A Erect and real B Inverted and real C Erect and virtual D Inverted and virtual Answer : B Explanation :
46.
 In science, a push or a pull on an object is called as  ____________ . A Pressure B Gravitation C Force D Friction Answer : C Explanation :
47.
 What will be the focal length when human eye lens becomes thin  ? A Increases B Decreases C Remain same D No option is correct Answer : A Explanation :
48.
 Energy is continuously created in the sun du to  : A Nuclear fusion B Nuclear fission C Radioactivity D Artificial Radioactivity Answer : A Explanation :
49.
 In electronics what comes under tank circuit  ? A Resistance and capacity B Resistance and Inductance C Capacity and Inductance D Resistance, capacity and inductance Answer : C Explanation :
50.
 The  substance which conducts current in the solid state is A Diamond B Graphite C Iodine D Sodium chloride Answer : B Explanation :
51.
 The best conductor of heat among the following is A Alcohol B Mercury C Ether D Water Answer : B Explanation :
52.
 Tungsten is used for the manufacture of the filament of an electric bulb, because A It is a good conductor B It is economical C It is malleable D It has a very high melting point Answer : D Explanation :
53.
 Dynamo is a device for converting A Heat energy into electrical energy B Mechanical energy into electrical energy C Magnetic energy into electrical energy D Chemical energy into electrical energy Answer : B Explanation :
54.
 Which of the following metals is used for the manufacture of heating elements provided in electric iron  ? A Nickel B Chromium C Nichrome D Tungsten Answer : C Explanation :
55.
 When the main switch of the house is put off it disconnects the A Live wire only B Live wire and the earth wire C Live wire and the neutral wire D Earth wire and the neutral wire Answer : C Explanation :
56.
 Magnetism in materials is due to A Electrons at rest B Circular motion of electrons C Protons at rest D All neutrons at rest Answer : B Explanation :
57.
 A multi meter is used to measure A Current B Voltage C Resistance D All of the above Answer : D Explanation :
58.
 The metal used to make lightning conductors is A Iron B Aluminium C Copper D Zinc Answer : C Explanation :
59.
 In a rechargeable cell what kind of energy is stored within the cell  ? A Electrical energy B Potential energy C Chemical energy D Kinetic energy Answer : C Explanation :
60.
 Superconductors are those elements A Whose conductivity is intermediate between metals and insulators B Whose resistance falls almost to zero at very low temperatures C Which turn into insulators at very low temperatures D Which conduct electricity only at super high temperatures Answer : B Explanation :
61.
 Fleming’s right hand rule is used to find the direction of the A Alternate current B Direct current C Induced current D Actual current Answer : C Explanation :
62.
 Which of the following circuit elements is used to  “block”  DC in an electronic circuit  ? A Resistances B Capacitances C Inductance D Diode Answer : B Explanation :
63.
 In the process of magnetisation of a bar A The entire bulk of the bar gets magnetised B Only the surface of the bar gets magnetised C Only the ends of the bar get magnetised D Only some parts of the outer layers of the bar get magnetised Answer : A Explanation :
64.
 The fuse in our domestic electric circuit melts when there is a high rise in A Inductance B Current C Resistance D Capacitance Answer : B Explanation :
65.
 Which of the following principle is used to produce  ‘low-temperatures’  ? A Super conductivity B Joule-Kelvin effect C Thermo-electric effect D Adiabatic demagnetisation Answer : D Explanation :
66.
 The ozone hole that has been detected lies in the atmosphere above A Arctic Ocean B Antarctica C India D Alaska Answer : B Explanation :
67.
 The device used to change the speed of an electric fan is A Amplifier B Regulator C Switch D Rectifier Answer : B Explanation :
68.
 If input frequency of a full wave rectifier be  n,  then output frequency would be A $\frac{n}{2}$ B $n$ C $\frac{3n}{2}$ D $2n$ Answer : D Explanation :
69.
 The spokes used in the wheel of a bicycle increase its A Moment of inertia B Velocity C Acceleration D Momentum Answer : A Explanation :
70.
 A transformer works on the principle of A Self-induction B Mutual induction C Generator D Inverter Answer : B Explanation :
71.
 The unit of electrical power is A Bolt B Watt C Kilowatt hour D Ampere Answer : B Explanation :
72.
 When a bar magnet is cut into two equal halves, the pole strength of each piece – A Becomes double B Becomes half C Becomes zero D Becomes the same Answer : D Explanation :
73.
 Pure water is bad conductor of electricity because it is A Feebly ionized B Not volatile C A very good solvent D A non-polar solvent Answer : A Explanation :
74.
 The nature of fuse wire is A High resistance and Low melting point B High resistance and High melting point C Low resistance and High melting point D Low resistance and low melting point Answer : A Explanation :
75.
 A transformer A Converts DC to AC B Is used to decrease or increase  AC voltage C Converts AC voltage to DC voltage D Converts electrical energy into mechanical energy Answer : B Explanation :
76.
 Electricity is transmitted over long distances A It is fast B There is less wastage of energy C It is safer D It is cheaper Answer : B Explanation :
77.
 The material used in the fabrication of a transistor is A Aluminium B Copper C Silicon D Silver Answer : C Explanation :