## general science

### Physics MCQ Questions and Answers Page - 1

1.
 The dimension of which of the following is the same as that of impulse? A Volume B Momentum C Torque D Change in the rate of momentum Answer : B Explanation : The dimension of both impulse and momentum are equal i.e MLT-1.
2.
 Which set of conditions represents the easiest way to liquify a gas  ? A Low temperature and high pressure B High temperature and low pressure C Low temperature and low pressure D High temperature and high pressure Answer : A Explanation :
3.
 The instrument that measures and records the relative humidity air is A Hydrometer B Hygrometer C Lactometer D Barometer Answer : B Explanation :
4.
 Which among the following is the fundamental quantity ? A Volume B Time C Velosity D Force Answer : B Explanation :
5.
 What is the minimum escape velocity of rocket to be launched in to space? A 5 km/sec B 6 km/sec C 11 km/sec D 16 km/sec Answer : C Explanation : The minimum escape velocity of rocket to be launched in to space is 11.186 km/sec. Escape velocity is the minimum velocity that has to be achieved by an object, to overcome the gravitational pull of the planet earth.
6.
 If the length of a simple pendulum is halved then its period of oscillation is A Doubled B Halved C Increased by a factor $\sqrt{2}$ D Decreased by a factor $\sqrt{2}$ Answer : D Explanation :
7.
 Mist is caused by A Dry ice B Ice at low temperature C Water vapour at low temperature D Carbon – monoxide in solid form Answer : C Explanation :
8.
 While catching a ball, a player pulls down his hands to lower the – A Force B Momentum C Impulse D Catching time Answer : B Explanation :
9.
 A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ? A Circle B Parabolic C Great circle D Hyper – parabolic Answer : B Explanation :
10.
 When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of  : A Evaporation B Vaporisation C Diffusion D Sublimation Answer : C Explanation :
11.
 Clear nights are colder than cloudy nights because of A Conduction B Condensation C Radiation D Insolation Answer : C Explanation :
12.
 In which of the following cases, kinetic energy is being used in performing work ? A Padding the bicycle to cover a distance B Driving a car to cover a distance C Wind mill grinding wheat grain D Rowing a boat in the lake Answer : B Explanation :
13.
 If the velocity – time graph of a particle is represented by   y = mt + c, then the particle is moving with A Constant speed B Constant velocity C Constant acceleration D Varying acceleration Answer : C Explanation : If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with constant acceleration.
14.
 A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to A Outward pull on him B Inertia of motion C Change in momentum D Change in acceleration Answer : B Explanation :
15.
 When pressure is increased, the melting point to ice A Increases B Does not change C Decreases D Depends on the impurities in the ice Answer : C Explanation :
16.
 Where are mesons found  ? A Cosmic rays B X-rays C Gamma rays D Laser beam Answer : A Explanation :
17.
 For a body moving with non-uniform velocity and uniform acceleration A Displacement – Time graph is linear B Displacement – Time graph is  non – linear C Velocity – Time graph is  non – linear D Velocity – Time graph is  linear Answer : B Explanation :
18.
 The fourth state of matter is known as A Gas B Vapour C Plasma D Electrons Answer : C Explanation : The fourth state of matter is known as plasma
19.
 Knot is a measure of A The speed of ship B The curvature of spherical objects C Solar radiation D Intensity of earthquake shock Answer : A Explanation : Knot is a measure of the speed of ship.
20.
 Which of the following pairs of physical quantities have the same dimensions ? A Force and power B Work and power C Work and energy D Momentum and power Answer : C Explanation :
21.
 The instrument for measuring intensity of earthquakes is called A Ediograph B Pantagraph C Ergograph D Seismograph Answer : D Explanation : The instrument for measuring intensity of earthquakes is called Seismograph
22.
 Pycnometer is an instrument used to measure the A Density B Intensity of solar radiation C Intensity of earthquake D High temperatures Answer : A Explanation :
23.
 Who defined the law of gravitation ? A Newton B Archimedes C Galileo D Faraday Answer : A Explanation :
24.
 The sensation of weightlessness in a spacecraft in an orbit is due to the A Absence of gravity outside B Acceleration in the orbit which is equal to the acceleration due to gravity outside C Presence of gravity outside but not inside the spacecraft D Fact that spacecraft in the orbit has no energy Answer : B Explanation :
25.
 Therm is the unit of A Power B Heat C Light D Distance Answer : B Explanation : Therm is the unit of heat.
26.
 Newton’s first law of motion gives the concept of A Energy B Work C Momentum D Inertia Answer : D Explanation :
27.
 We always see the same face of the moon, because A It is smaller than the earth B It revolves on its axis in a direction opposite to that of the earth C It takes equal time for revolution around the earth and rotation on its own axis D It rotates at the same speed as the earth around the sum Answer : C Explanation :
28.
 Which of the following instruments is used to measure humidity ? A Kata thermometer B Anemometer C Sling psychrometer D Clinical thermometer Answer : C Explanation :
29.
 Which of the following is most elastic ? A Rubber B Wet  clay C Steel D Plastic Answer : C Explanation :
30.
 The swing of a spinning cricket ball in air can be explained on the basis of A Sudden  change in wind direction B Buoyancy  of air C Turbulence  caused by wind D Bernoulli’s  theorem Answer : C Explanation :
31.
 What should a person on a freely rotating turn table do to decrease his (angular) speed ? A Bring his hands together B Raise his hands up C Spread his hands outwards D Sit down with Raised hands Answer : C Explanation :
32.
 Smog is a combination of A Air and water vapours B Water and smoke C Fire and water D Smoke and fog Answer : D Explanation :
33.
 A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls A Behind him B In front of him C Into his hand D By his side Answer : A Explanation :
34.
 A kilowatt-hour is unit of A Energy B Power C Electric charge D Electric current Answer : A Explanation :
35.
 Ventilators are provided near the celling of the room because A The exhaled warmer air rises up and goes out B These provide cross ventilation in the room C These provide some sunlight in the room D These do not look nice in the lower part Answer : A Explanation :
36.
 In severe winter, in cold countries water pipes burst because A Water expands on freezing B Contraction of water pipes C High atmospheric pressure D Combined effect of all the above three Answer : D Explanation :
37.
 The density of a gas is maximum at A Low temperature, low pressure B Low temperature, high pressure C High temperature, low pressure D High temperature, high pressure Answer : B Explanation :
38.
 The spoon dropped by an astronaut in a satellite will A Fail to the floor B Remain stationary C Continue to follow the motion of the satellite D Move tangentially away Answer : C Explanation :
39.
 A person is hurt on kicking a stone due to A Inertia B Velocity C Reaction D Momentum Answer : C Explanation : A person is hurt on kicking a stone due to reaction.
40.
 Which of the following is an example for cantilever beam ? A Diving board B Bridge C See-saw D Common balance Answer : B Explanation :
41.
 Which of the following liquids has the least density ? A Fresh water B Salt water C Petrol D Mercury Answer : C Explanation :
42.
 Two stones of different masses are dropped simultaneously from the top of a building A Smaller stone reaches the ground earlier B Larger stone reaches the ground earlier C Both the stones reach the ground at the same time D Depends on the composition of the stone Answer : C Explanation :
43.
 Intensity of gravitational field of earth is maximum at A Poles B Equator C Centre of earth D Surface Answer : A Explanation :
44.
 When a ship enters the sea from a river A It rises a little B It sinks a little C It remains at the same level D It rises or sinks depending on the material it is made of Answer : A Explanation :
45.
 The centre of gravity of a sprinter during the race lies A Ahead of his feet B Behind his feet C At the centre of the body D To the left side of the body Answer : A Explanation :
46.
 A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ? A Increase B Decrease C Remain constant D Will increase first and then decrease Answer : A Explanation :
47.
 The period revolution of a geostationary satellite is A 365 days B 30 days C 24 days D Changing continuously Answer : C Explanation :
48.
 A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ? A They must have the same volume B They must have the same density C They must have the same mass D They must be dropped in vacuum Answer : D Explanation :
49.
 The atmospheric air is held to the Earth by : A Gravity B Winds C Clouds D Rotation of the Earth Answer : A Explanation :
50.
 The time period of a seconds pendulum is A 1 second B 2 seconds C 0.5 second D 1.5 seconds Answer : B Explanation :
51.
 Amount of water vapour in the atmosphere is measured in terms of A Humidity B Droplets C Smog D All of the above Answer : A Explanation :
52.
 The density of the liquid when heated A Decreases B Increases C Does not change D May increase or decrease depending on pressure Answer : A Explanation :
53.
 When hot-water is sprinkled on a hotter glass tumbler, it breaks because A Glass suddenly expands B Glass suddenly contracts C Water evaporates D Glass reacts chemically with water Answer : B Explanation :
54.
 Mud houses are cooler in summers and warmer in winters as compared to brick houses because A Mud is a good conductor B Mud is a bad conductor C Mud is a poor insulator D Evaporation of water causes cooling in summers and sunlight coming through holes causes warming i Answer : B Explanation :
55.
 Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be A At a higher level in water B At a higher level in alcohol C At the same level in both D Floating in alcohol and sinking in water Answer : A Explanation :
56.
 What is the principle of a ‘Life Jacket’ ? A It provides oxygen to a drowning person B It increases the volume of the person to keep him afloat C It decreases the volume of the person to keep him afloat D The person can sit on it like a raft Answer : B Explanation :
57.
 A sphere rolls down on two inclined planes of different angles but same height, it does so A In the same time B With the same speed C In the same time with the same speed D In the same time with the same kinetic energy Answer : B Explanation :
58.
 A rubber ball is dropped from a height of 2 meters. To what height will it rise if there is no loss of energy / velocity after rebounding ? A 4 meters B 3 meters C 2 meters D 1 meter Answer : C Explanation :
59.
 When a pall of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is A Below a certain minimum value irrespective of amount of water in the pail B Above a certain minimum value irrespective of amount of water in the pail C Above a certain minimum value depending on amount of water in the pail D Below a certain minimum value depending on amount of water in the pail Answer : B Explanation :
60.
 Who enunciated the laws of planetary motion ? A Nicolaus Copernicus B Johannes Kepler C Isaac Newton D Galileo Answer : B Explanation :
61.
 When a person sitting on a swing stands up on the swing, the frequency of oscillation A Decreases B Increases C Becomes infinite D Does not change Answer : B Explanation :
62.
 An aircraft can perform aerobatic manoeuvres in a vertical loop because of A Gravity B Centripetal force C Weight D Centrifugal force Answer : A Explanation :
63.
 Which conservation principle is applicable in the case of the motion of a rocket ? A Conservation of mass B Conservation of charge C Conservation of momentum D Conservation of energy Answer : C Explanation :
64.
 It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because A Weights of buckets are balanced B Centre of gravity falls within the body C Centre of gravity and Centre of equilibrium fall within the feet D Resultant weight of buckets is zero Answer : C Explanation :
65.
 An athlete runs before long jump to get advantage on A Inertia of motion B Frictional force C Moment od a force D Principle of moments Answer : A Explanation :
66.
 A pilot has to release the bomb to hit a target A Right above the target B Beyond the target C Before the target D None of these Answer : C Explanation :
67.
 A light year is a measure of : A Speed B Velocity C Distance D Time Answer : C Explanation :
68.
 A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments A Is zero B Depends on the total mass of all the fragments C Depends on the speeds of various fragments D Is infinity Answer : A Explanation :
69.
 The slope of a velocity-time graph represents A Acceleration B Displacement C Distance D Speed Answer : A Explanation :
70.
 How much mechanical work must be done to completely melt 1 gram of ice at 00C ? A 4.2 J B 80 J C 336 J D 2268 J Answer : B Explanation :
71.
 A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is A Zero B One C Less than one D More than one Answer : A Explanation :
72.
 The temperature which has the same reading on both Fahrenheit and Celsius scales is A 400 B -400 C -340 D -1400 Answer : B Explanation :
73.
 A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect ? A Near the bottom B In the middle of the bottom C Near the neck D Bubbles remain distributed uniformly Answer : C Explanation :
74.
 The angle in which a cricket ball should be hit to travel maximum horizontal distance is : A 600 with horizontal B 450 with horizontal C 300 with horizontal D 150 with horizontal Answer : B Explanation :
75.
 As we go from Equator to North pole the value of ‘g’ the acceleration due to gravity A Remains the same B Decreases C Increases D None of the above Answer : C Explanation :
76.
 In the Earth, the weight of a body is maximum at the A North pole B South pole C Equator D Surface Answer : D Explanation :
77.
 A man inside an artificial satellite feels weightlessness because the force of of attraction due to earth is A Zero at that place B Is balanced by the force of attraction due to moon C Equal to the centripetal force D Non-effective due to particular design of the satellite Answer : A Explanation :
78.
 Ozone layer above the surface of Earth provides a shield against A X-rays B Ultra-violet rays C Gamma rays D Infra-red rays Answer : B Explanation :
79.
 A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum : A Just after it is dropped B When it is just on the half-way C Just before it touches the ground D When it touches the ground Answer : C Explanation :
80.
 Which of the following properties is generally found in non-metals ? A Brittleness B Conductivity C Ductility D Malleability Answer : A Explanation :
81.
 The type of mirror used in automobiles to see the traffic on the rear side is A Concave B Plano-Convex C Plane D Convex Answer : D Explanation :