## general science

### Physics MCQ Questions and Answers Page - 5

1.
 Hydro-electric power is a : A Non-renewable natural resource B A mixture of renewable and non-renewable natural resource C Neither renewable nor non renewable resource D Renewable natural resource Answer : D Explanation :
2.
 A drop of liquid assumes spherical shape because : A Intermolecular forces are strong in liquids B A sphere has the least surface area for a given volume C A sphere has the largest surface area for a given volume D Inter molecular forces are weak in liquids Answer : B Explanation :
3.
 If cream is removed from milk, its density A Increases B Decreases C Remains the same D May increase or decrease Answer : A Explanation :
4.
 The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall A Depends on the thickness of the wall B Increases with height of the wall C Increases with depth of the wall D Depends on the area of the wall Answer : C Explanation :
5.
 Materials for rain proof coats and tents owe their water proof properties to A Surface tension B Viscosity C Specific gravity D Elasticity Answer : A Explanation :
6.
 When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together ? A Hydrogen bond formation B Vander waals forces C Covalent attraction D Dipole interaction Answer : A Explanation :
7.
 Microphone is a device which transforms the A Sound signal into current signal B Current signal into sound signal C Sound signal into light signal D Light signal into sound signal Answer : A Explanation :
8.
 Pressure Cooks faster because A Boiling point decreases with rise of pressure B It cooks the food at low pressure C Higher temperature is attained for cooking D The material of the cooker is a good conductor Answer : C Explanation :
9.
 It is easier for a man to swim in sea water, than in river water because A The density of sea water is lesser than the density of river water B The density of sea water is more than the density of river water C The sea is deeper than the river D The sea is wider than the river Answer : B Explanation :
10.
 The characteristic invalid for heat radiation is that it travels : A In a straight line B In all directions C With the speed of light D Heating the medium through which it passes Answer : C Explanation :
11.
 Water is not suitable as a calorimetric substance because it : A Has high specific heat B Is a good conductor C Has high boiling point D Low latent heat of vapurization Answer : A Explanation :
12.
 In a water lifting electric pump, we convert A Electrical energy into Potential energy B Kinetic energy into Electrical energy C Kinetic energy into Potential energy D Electrical energy into Kinetic energy Answer : A Explanation :
13.
 The earth is a A Good reflector of heat B Non-absorber of heat C Good absorber and good radiator of heat D Bad absorber and bad radiator of heat Answer : C Explanation :
14.
 When a piece of stone is immersed in water, it displaces water of equal A Density B Specific gravity C Mass D Volume Answer : C Explanation :
15.
 The wavelength at which the peak of intensity of blackbody radiation occurs A Increases with increase in temperature B Decreases with increase in temperature C Is the same at all temperatures D Does not follow any pattern as temperature changes Answer : B Explanation :
16.
 Man perceives sound vibrations in the frequency ranges of A 0 – 5 Hz B 6 – 10 Hz C 11 – 15 Hz D 20 – 20000 Hz Answer : D Explanation :
17.
 The ordinary and maximum tolerance limit of sound by human being is A 50 db to 70 db (decibel) B 60 db to 80 db (decibel) C 65 db to 75 db (decibel) D 70 db to 85 db (decibel) Answer : B Explanation :
18.
 Steel is more elastic than rubber because it : A Requires larger deforming force B Is never deformed C Is deformed very easily D Is harder than rubber Answer : C Explanation :
19.
 Outside of cooking utensils are generally left black from below because A It is difficult to clean dally B Black surface is a good conductor of heat C Black surface is a poor conductor of heat D Black surface is a good absorber of heat Answer : D Explanation :
20.
 A liquid disturbed by sitting comes to rest due to A Density B Surface tension C Viscosity D Centripetal force Answer : C Explanation :
21.
 Instrument used to study the behaviour of a vibrating string is : A Barometer B Hydrometer C Hygrometer D Sonometer Answer : D Explanation :
22.
 When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are A Longitudinal B Transverse C Both Longitudinal and Transverse D Waves are not produced Answer : B Explanation :
23.
 When a body is immersed in a liquid, the force acting on it is A Up-thrust B Weight C Mass D Both (a) and (b) Answer : D Explanation :
24.
 The locomotion of insects to the source of light is called : A Phototropic B Hydrotropic C Phototactic D Thermotactic Answer : A Explanation :
25.
 Which one among the following doesn’t have any effect on velocity of sound ? A Pressure B Temperature C Humidity D Density Answer : C Explanation :
26.
 Green house effect is the heating up of the Earth’s atmosphere which is due to A The ultraviolet rays B $\gamma&space;-&space C The infra-red rays D X-rays Answer : C Explanation :
27.
 If the phase difference between two points is 1200 for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is A 1 cm B 6 cm C 12 cm D 24 cm Answer : D Explanation :
28.
 Clouds float in the atmosphere because of their A Low pressure B Low density C Low  viscosity D Low  temperature Answer : B Explanation :
29.
 The freezing point of fresh water is  _________ . A 40 C B 30 C C 50 C D 00 C Answer : D Explanation :
30.
 The unit of noise pollution (level) is : A Decibel B Decimal C Ppm D None of these Answer : A Explanation :
31.
 A real gas can act as an ideal gas in A High pressure and low temperature B Low pressure and high temperature C Low pressure and high temperature D Low pressure and low temperature Answer : B Explanation :
32.
 Purity of a metal can be determined with the help of A Pascal’s law B Boyle’s law C Archimedes principle D Conservation of mass principle Answer : C Explanation :
33.
 The work done by the string of a simple pendulum during one complete oscillation is equal to A Total energy of the pendulum B Kinetic energy of the pendulum C Potential energy of the pendulum D Zero Answer : D Explanation :
34.
 The minimum number of forces to keep a particle in equilibrium is A 1 B 2 C 3 D 4 Answer : B Explanation :
35.
 Which of the following devices can be used to detect radiant heat ? A Liquid thermometer B Six’s maximum and minimum thermometer C Constant volume air thermometer D Thermopile Answer : D Explanation :
36.
 The device used to convert solar energy into electricity is A Photovoltaic cell B Daniell cell C Electrochemical cell D Galvanic cell Answer : A Explanation :
37.
 The word ‘insolation’ means A Matters which insulate B Incoming solar radiation C Insoluble matters D None of the above Answer : B Explanation :
38.
 While ascending a hill, the driver of the vehicle keeps the gear ratio A Equal to 1 B Less than 1 C Greater than 1 D Either equal to or greater than 1 Answer : D Explanation :
39.
 The boiling point of water decreases at higher altitudes is due to A Low temperature B Low atmospheric pressure C High temperature D High atmospheric pressure Answer : B Explanation :
40.
 Loudness of sound depends on A Frequency B Wavelength C Amplitude D Pitch Answer : C Explanation :
41.
 A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an A Audible wave B Infrasonic wave C Ultrasonic wave D Microwave Answer : A Explanation :
42.
 The waves used in sonography are A Micro waves B Infra-red waves C Sound waves D Ultrasonic waves Answer : D Explanation :
43.
 The first law of thermodynamics is simply the case of A Charle’s law B Newton’s law of cooling C The law of heat exchange D The law of conservation of energy Answer : D Explanation :
44.
 Hertz is a unit for measuring A Intensity of waves B Frequency of waves C Wavelength D Clarity of waves Answer : B Explanation :
45.
 It is easy to burst a gas-filled balloon with a needle than with a nail. It is because A Nail is more longer than needle B Nail exerts more pressure than needle on the balloon. C Needle exerts more pressure than nail on the balloon. D Gas is reactive with the needle. Answer : C Explanation :
46.
 Ice is packed in saw dust because A Saw dust will not get melted easily. B Saw dust is poor conductor of heat. C Saw dust is a good conductor of heat. D Saw dust does not stick to the ice. Answer : B Explanation :
47.
 Burns caused by steam are much severe than those caused by boiling water because A Steam pierces through the pores of body quickly B Steam has latent heat C Steam is gas and engulfs the body quickly D Temperature of steam is higher Answer : B Explanation :
48.
 Sound is heard over longer distances on rainy days because A Sound travels slowly in moist air B Sound travels faster in moist air C Moist air does not absorb sound D Moist air absorbs sound Answer : B Explanation :
49.
 We feel cool when we sit near the fan, this is because A Fan gives cool air B Fan cools surrounding air C Air vapourises the sweat on our body D We feel cool when air touches the body Answer : C Explanation :
50.
 The average kinetic energy  of the molecules of an ideal gas is directly proportional to A Velocity of Molecules B Mass of Molecules C Absolute temperature of the gas D Temperature of environment Answer : C Explanation :
51.
 Which of the following property of sound is affected by change in air temperature ? A Frequency B Intensity C Amplitude D Wavelength Answer : D Explanation :
52.
 The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes ? A 50 : 18 B 25 : 9 C 3 : 5 D 5 : 3 Answer : D Explanation :
53.
 Blowing Air with open pipe is an example of : A Isothermal process B Isochoric process C Isobaric process D Adiabatic process Answer : C Explanation :
54.
 A cycle tyre bursts suddenly. This represents an : A Isothermal process B Adiabatic process C Isochoric process D Isobaric process Answer : B Explanation :
55.
 Super cooling stands for cooling of a liquid : A At freezing point B Below freezing point C At melting point D Above melting point Answer : B Explanation :
56.
 Alcohol is more volatile than water because  ________  is lower than water. A Its boiling point B Its density C Its viscosity D Its surface tension Answer : A Explanation :
57.
 Which of the following is the second largest source of global energy ? A Fossil fuel B Nuclear energy C Renewable energy D None of these Answer : C Explanation :
58.
 Which of the following is the unit of prrceived loudness of sound ? A Decibel B Sone C Hertz D Phon Answer : B Explanation :
59.
 Stress can be defined as  ________  quantity. A Scalar B Vector C Phasor D Tensor Answer : D Explanation :
60.
 Which term is not associated with sound wave ? A Hertz B Decibel C Candela D Mach Answer : C Explanation :
61.
 When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will : A Remain same B Double C Three times D Four times Answer : B Explanation :
62.
 When a ship enters the sea from a river what will be the effect ? A It lowers B It sways C It rises a little D It jolts Answer : C Explanation :
63.
 Hydroscope is an instrument that shows changes in : A Sound under water B Atmospheric humidity C Density of liquid D Elevation of land Answer : C Explanation :
64.
 The cooling by desert Cooler is based on : A Hot air replacement B Air dehydration C Evaporative Cooling D Air rehydration Answer : C Explanation :
65.
 Which of the following is the methods of heat transfer ? A Convection B Evaporation C Revolution D Thermal Expansion Answer : A Explanation :
66.
 At boiling point of liquids, its A Temperature increases B Atmospheric pressure increases C Temperature remains constant D Vapour pressure decreases Answer : C Explanation :
67.
 On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because A Mercury is a metal B Density of mercury is greater than that of water C Cohesion of mercury is greater than its adhesion with glass D Cohesion of water is greater than its adhesion with glass Answer : C Explanation :
68.
 The boiling point of water depends upon the A Atmospheric pressure B Volume C Density D Mass Answer : A Explanation :
69.
 During which of the following operating conditions of an automobile, carbon monoxide content in exhaust gas is maximum ? A Acceleration B Cruising C Idle running D Deacceleration Answer : C Explanation :
70.
 Intensity of any wave is proportional to which of the following ? A Amplitude B Square of amplitude C Square root of amplitude D Cube of amplitude Answer : B Explanation :
71.
 Water is used in a hot water bag because A It is easily available B It has high specific gravity C It has high specific heat D It is a liquid substance Answer : C Explanation :
72.
 What type of force acts on a car moving around a curve ? A Centrifugal force B Cohesive force C Centripetal force D Gravitational force Answer : C Explanation :
73.
 Which of the metals has the maximum thermal conductivity ? A Iron B Aluminium C Silver D Copper Answer : C Explanation :
74.
 Which of the following is the cleanest source of energy ? A Biofuel B Fossil fuel C Nuclear power D Wind energy Answer : D Explanation :
75.
 The spring balance works on the principle of  __________ . A Boyle’s Law B Hooke’s Law C Bernoulli’s principle D Pascal’s Law Answer : B Explanation :
76.
 At hill stations, the boiling point of water will be A Same as at sea level B Less than that at sea level C More than that at sea level D Equal to the melting point of ice Answer : B Explanation :
77.
 Kinetic energy depends on A The velocity or speed of the moving body B The mass of the moving body C The pressure of the moving body D Both mass and velocity of the moving body Answer : D Explanation :
78.
 In which from is the supplied heat energy stored during change in temperature of substance ? A Heat energy B Kinetic energy C Potential energy D Both kinetic and potential energy Answer : B Explanation :
79.
 In hydel power station, the motion produced in turbines is due to A Flow of water B Burning of coal C Burning of diesel D Production of steam Answer : A Explanation :
80.
 The quality or tone of a musical sound produced by a stringed instrument depends on A Frequency of vibration B Length of the strings in the instrument C Amplitude of vibration D Wave form of the sound Answer : D Explanation :
81.
 During washing of clothes, we use indigo due to its A Better cleaning action B Proper pigmental composition C High glorious nature D Very low cost Answer : B Explanation :