## general science

### Physics MCQ Questions and Answers Page - 7

1.
 A soap bubble shows colours when illuminated with white light. This is due to A Diffraction B Polarisation C Interference D Reflection Answer : C Explanation :
2.
 The instrument used to see the distant objects on the Earth is A Terrestrial telescope B Astronomical telescope C Compound microscope D Simple microscope Answer : A Explanation :
3.
 Global warming is expected to result in A Increase in level of sea B Change in cop pattern C Change in coast line D All of the above Answer : D Explanation :
4.
 A concave lens always forms an image which is A Real and erect B Virtual and erect C Real and inverted D Virtual and inverted Answer : B Explanation :
5.
 Optical fibres are based on the phenomenon of A Interference B Dispersion C Diffraction D Total internal Reflection Answer : D Explanation :
6.
 Lens is made up of A Pyrex glass B Flint glass C Ordinary glass D Cobalt glass Answer : B Explanation :
7.
 One can distinguish  a telescope from a microscope by observing A Length B Colour C Size of the lens D Length and size of the lens Answer : D Explanation :
8.
 A new technology which provides the ability to create an artificial world and have people interact with it is called  : A Televirtuality B Virtual reality C Alternate reality D 3-D reality Answer : B Explanation :
9.
 Which one of the following determines the sharpness of image in a camera  ? A The aperture B The exposure time C The focal length of the lens D Size of the camera Answer : A Explanation :
10.
 For a person having hypermetropia, the near point is A Greater than 25 cm B Greater than 50 cm C Less than 25 cm D Infinity Answer : A Explanation :
11.
 Eclipses occur to which optical phenomena  ? A Reflection B Refraction C Rectilinear propagation D Diffraction Answer : C Explanation :
12.
 Persistence of vision is the principle behind A Camera B Spectroscope C Cinema D Periscope Answer : C Explanation :
13.
 A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes A Behind the retina B In front of the retina C On the retina D On the blind pot Answer : B Explanation :
14.
 Myopia is the same as A Near sightedness B Astigmatism C Presbyopia D Long sightedness Answer : A Explanation :
15.
 A microscope used in pathological laboratories forms A Magnified, virtual, erect image B Diminished, real and erect image C Magnified, virtual, and inverted image D Diminished, virtual and erect image Answer : C Explanation :
16.
 The magnifying power of n astronomical telescope can be decreased by A Decreasing the focal length of the eyepiece B Increasing the focal length of the eyepiece C Increasing the focal length of the objective D None of these Answer : B Explanation :
17.
 The owl can see most clearly in total darkness because A It has squint eyes B It has large eyes with orbs directed forward, giving it binocular sight C It has light bulbs in its eyes provided by nature D It produces infrasonic sounds Answer : B Explanation :
18.
 Which colour of light shows maximum deviation when passed through a prism  ? A Red B Green C Violet D Yellow Answer : C Explanation :
19.
 Night photography and photography in mist and fog are possible using A Ultra-violet radiation B Infra-red radiation C Microwave radiation D Gamma radiation Answer : B Explanation :
20.
 The blue colour of water in the sea is due to A Absorption of other colours except blue by water molecules B Scattering of blue light by water molecules C Reflection of blue light by impurities in sea water D Reflection of blue sky by sea water Answer : A Explanation :
21.
 Rainbow is seen after rain because of hanging molecules of water which act as A Lenses B Mirrors C Prisms D Slabs Answer : B Explanation :
22.
 Which of the following is optical illusion  ? A Rainbow B Earthshine C Halo D Mirage Answer : D Explanation :
23.
 In sunlight a rose appears red. In green light, the same rose appears A Red B Black C Green D Yellow Answer : B Explanation :
24.
 The sparkling of a diamond is due to A Total internal reflection of light B Interference of light C Polarisation of light D Refraction of light Answer : A Explanation :
25.
 It is dangerous to observe solar eclipse with naked eyes because A Infrared radiations from sun burn our retina B Ultraviolet radiations from sun burn our retina C All radiations from sun initiate chemical reactions in eyes D Cosmic rays reach eyes more during the eclipse Answer : B Explanation :
26.
 These waves cannot be transmitted through vacuum A Light B Sound C Heat D Electromagnetic Answer : B Explanation :
27.
 Stars in the sky appear to twinkle due to A A series of refractions B A series of reflections C A surface tension phenomenon D Multiple diminishing brightness Answer : A Explanation :
28.
 Small bubbles are perfectly spherical because of A Gravity B Pressure C Viscosity D Surface tension Answer : D Explanation :
29.
 The final image in a simple microscope is A Real, diminished and inverted B Real, magnified and erect C Virtual, magnified and erect D Virtual, diminished and erect Answer : C Explanation :
30.
 Two rods, one of copper and other of steel, experience the same up-thrust when placed in water. Thus, both have A Equal volume B Equal weight C Equal density D Equal mass Answer : A Explanation :
31.
 Hypermetropia or long-sight can be corrected by using  : A Bifocal lenses B Cylindrical lenses C Concave lenses D Convex lenses Answer : D Explanation :
32.
 In mirrors the back surface is coated with a thin layer of  : A Mercury B Silver C Red oxide D Silver nitrate Answer : B Explanation :
33.
 An optically plane surface reflects a beam of light A As a parallel beam in one direction B As diffused beams in all directions C As parallel beams in all directions D As a diffused beam in one direction Answer : C Explanation :
34.
 A periscope work on the principle of A Refraction B Total internal reflection C Diffraction D Reflection Answer : B Explanation :
35.
 A rear-view mirror for driving is A Plain B Concave C Convex D Inverted Answer : D Explanation :
36.
 Tear gas used by the police to disperse the mob contains A Carbon dioxide B Chlorine C Ammonia D Hydrogen sulphide Answer : B Explanation :
37.
 The part of the eye having the larger refractive index is  : A Cornea B Aqueous humor C Lens D Vitreous humor Answer : C Explanation :
38.
 A man cannot see clearly beyond 10 metres. The disease he suffers from  : A Far sight B Myopia C Cataract D Hypermetropia Answer : B Explanation :
39.
 Light beam which is highly directional is called  : A Eraser B Grazer C Maser D Laser Answer : D Explanation :
40.
 Energy in reflected light  : A Does not depends on the angle of incidence B Increases with the increase in angle C Decreases with the increase in angle of incidence D Becomes maximum for angle of incidence equal to 450 Answer : B Explanation :
41.
 Which colour of light shows maximum deviation when passed through a prism  ? A White B Red C Violet D Green Answer : C Explanation :
42.
 When a light wave is reflected from a mirror, there is a change in its A Frequency B Amplitude C Wavelength D Velocity Answer : B Explanation :
43.
 Magnifying Glass is basically a A Plano-concave lens B Concave lens C Convex lens D Cylindrical lens Answer : C Explanation :
44.
 The head mirror used by ENT doctors is A Concave B Convex C Plane D Plano-convex Answer : A Explanation :
45.
 Direct conversion solar energy with the use of a photo voltaic cell results in the production of A Optical energy B Electrical energy C Thermal energy D Mechanical energy Answer : B Explanation :
46.
 White clothes are cooler than black ones because they A Absorb all the light that reaches them B Reflect all the light that reaches them C Will not allow the light to penetrate D Cool the sunlight completely Answer : B Explanation :
47.
 The primary colours in photography are A Red, Blue, Yellow B Red, Yellow, Green C Red, Blue, Green D Blue, Yellow, Green Answer : A Explanation :
48.
 For a ray of light to suffer total internal reflection it has to pass from  : A Glass to water B Water to glass C Air to water D Air to glass Answer : A Explanation :
49.
 A black body can absorb radiation of  : A Lower wavelengths only B Intermediate wavelengths only C Higher wavelengths only D All wavelengths Answer : D Explanation :
50.
 Persons suffering from myopia are advised to use A Convex lens B Concave lens C Plano-convex lens D Plano-concave lens Answer : B Explanation :
51.
 Conversion of sound energy into electrical energy is done by A Solar cell B Gramophone C Microphone D Loudspeaker Answer : C Explanation :
52.
 Convex mirrors are used as a rear view mirror in motor cycles because A It forms virtual image B It forms erect (upright) image C It forms smaller image as compared with object D All of the above Answer : D Explanation :
53.
 A star appears twinkling in the sky because of A Scattering of light by atmosphere B Reflection of light by atmosphere C Refraction of light by atmosphere D Diffraction of light by atmosphere Answer : C Explanation :
54.
 A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. A Reflection B Refraction C Diffraction D Total internal reflection Answer : D Explanation :
55.
 Persistence of vision is the Principle behind  : A Binocular B Cinema C Periscope D Camera Answer : B Explanation :
56.
 Time of exposure required for taking photograph of an object depends upon the A Brightness of the object B Skill of photographer C Proximity of object D Size of the object Answer : A Explanation :
57.
 Which one of the following is responsible for the working of Newton’s colour disc experiment  ? A Formation of pure spectra B Formation of impure spectra C Persistence of vision D Principle of complementary colour Answer : C Explanation :
58.
 What is a compound microscope  ? A A microscope that has one lens. B A microscope that has two sets of lenses : an ocular lens and an eyepiece. C A microscope whose lenses are concave. D A microscope whose lenses are convex. Answer : B Explanation :
59.
 Sensitivity of the human eye is maximum in the A Violet region B Green region C Blue region D Red region Answer : B Explanation :
60.
 Which of the following is  not  caused by atmospheric refraction of light  ? A Sun appearing red at sunset B Twinkling of stars at night C Sun appearing higher in the sky than it actually is D Sun becoming visible two or three minutes before actual sunrise Answer : C Explanation :
61.
 Dioptere is the unit of A Power of a lens B Focal length of a lens C Light intensity D Sound intensity Answer : A Explanation :
62.
 A white and smooth surface is A Good absorber and good reflector of heat B Bad absorber and good reflector of heat C Good absorber and bad reflector of heat D Bad absorber and bad reflector of heat Answer : B Explanation :
63.
 An object which absorbs all colours and reflects none appears  : A White B Grey C Blue D Black Answer : D Explanation :
64.
 The splitting of white light into its components is due to  : A Reflection B Refraction C Transmission D Dispersion Answer : D Explanation :
65.
 The threshold frequency is the frequency below which  : A Photo current increases with voltage B Photo current decreases with voltage C Photo electric emission is not possible D Photo current is constant Answer : C Explanation :
66.
 Transition ions absorb light in  : A Infrared region B Ultraviolet region C Microwave region D Visible region Answer : D Explanation :
67.
 A thin oil film on a water surface appears coloured because of A Reflection B Interference C Diffraction D Polarization Answer : B Explanation :
68.
 Golden view of sea shell is due to A Diffraction B Dispersion C Polarization D Reflection Answer : C Explanation :
69.
 Rainbow is formed due to A Refraction and dispersion B Scattering and refraction C Diffraction and refraction D Refraction and reflection Answer : D Explanation :
70.
 An electron microscope gives higher magnifications than an optical microscope because  : A The velocity of electrons is smaller than that of light B The wavelength of electrons is smaller as compared to the wavelength of visible light C The electrons have more energy than the light particulars D The electron microscope uses more powerful lenses Answer : B Explanation :
71.
 The mercury and sodium street lamps light up because of  : A Atomic emission B Atomic absorption C Electron emission D Electron absorption Answer : A Explanation :
72.
 Which of the following colour of light deviates least through the prism  ? A Yellow B Green C Violet D Red Answer : D Explanation :
73.
 Which one of the following is not a feature of Indifference Curve  ? A They do not intersect each other B They slope downwards to the right C They are parallel to each other D They are concave to each other Answer : D Explanation :
74.
 Rainbows are produced when sunlight  : A Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction B Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and inte C Incident on rain drops hanging in the atmosphere is dispersed after suffering reflection D None of the given statements is correct Answer : B Explanation :
75.
 Which of these travels in glass with minimum velocity  ? A Red light B Violet light C Green light D Yellow light Answer : B Explanation :
76.
 The phenomenon which causes mirage is A Interference B Diffraction C Polarisation D Total internal reflection Answer : D Explanation :
77.
 A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes  : A $\frac{x}{2}$ B $x$ C $2x$ D $\frac{x}{4}$ Answer : B Explanation :
78.
 Distant objects are visible as a little out of focus in this condition  : A Presbyopia B Hypermetropia C Astigmatism D Myopia Answer : D Explanation :
79.
 The redness in atmosphere at Sunrise and Sunset is due to  : A Refraction of light B Reflection of light C Dispersion of light D Scattering of light Answer : D Explanation :
80.
 Which one of the following reflects back more sunlight as compared to other three  ? A Sand desert B Land covered with fresh snow C Prairie land D Paddy crop land Answer : B Explanation :
81.
 The least distance of distinct vision is A 35 cm B 25 cm C 45 cm D 15 cm Answer : B Explanation :
82.
 Purpose of an optical filter is to A Reflect lights of different colours B Dispense light into component colours C Refract light of different colours D Transmit or absorb light of different colours Answer : D Explanation :