Practice MCQ physics

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3189 It is easier to roll a stone up a sloping road than to lift it vertical upwards because
Options:work done in rolling is more than in lifting,    work done in lifting the stone is equal to rolling it,    work done in both is same but the rate of doing work is less in rolling,    work done in rolling a stone is less than in lifting it

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3190 The absorption of ink by blotting paper involves
Options:viscosity of ink,    capillary action phenomenon,    diffusion of ink through the blotting,    siphon action

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3191 Siphon will fail to work if
Options:the densities of the liquid in the two vessels are equal,    the level of the liquid in the two vessels are at the same height,    both its limbs are of unequal length,    the temperature of the liquids in the two vessels are the same

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3192 Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
Options:the heating effect of current alone,    hysteresis loss alone,    both the heating effect of current and hysteresis loss,    intense sunlight at noon

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3193 Nuclear sizes are expressed in a unit named
Options:Fermi,    angstrom,    newton,    tesla

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3194 Light year is a unit of
Options:time,    distance,    light,    intensity of light

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3195 Mirage is due to
Options:unequal heating of different parts of the atmosphere,    magnetic disturbances in the atmosphere,    depletion of ozone layer in the atmosphere,    equal heating of different parts of the atmosphere

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3196 Light from the Sun reaches us in nearly
Options:2 minutes,    4 minutes,    8 minutes,    16 minutes

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3197 Stars appears to move from east to west because
Options:all stars move from east to west,    the earth rotates from west to east,    the earth rotates from east to west,    the background of the stars moves from west to east

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3198 Pa(Pascal) is the unit for
Options:thrust,    pressure,    frequency,    conductivity

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3199 Planets do not twinkle because
Options:they emit light of a constant intensity,    their distance from the earth does not change with time,    they are very far away from the earth resulting in decrease in intensity of light,    they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

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3200 Metals are good conductors of electricity because
Options:they contain free electrons,    the atoms are lightly packed,    they have high melting point,    All of the above

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3201 Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
Options:will overflow,    will not rise,    depressed,    change its meniscus

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3202 Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Options:Pressure and Young's modules,    Planck's constant and Angular momentum,    Impulse and moment of force,    Force and rate of change of linear momentum

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3203 If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
Options:velocity,    momentum,    acceleration,    kinetic energy

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3204 Pick out the scalar quantity
Options:force,    pressure,    velocity,    acceleration

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3205 Rectifiers are used to convert
Options:Direct current to Alternating current,    Alternating current to Direct current,    high voltage to low voltage,    low voltage to high voltage

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3206 out of the following, which is not emitted by radioactive substance?
Options:Electrons,    Electromagnetic radiations,    Alpha particles,    Neutrons

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3207 Sound waves in air are
Options:transverse,    longitudinal,    electromagnetic,    polarised

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3208 Magnetism at the centre of a bar magnet is
Options:minimum,    maximum,    zero,    minimum or maximum

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3209 It is more difficult to walk on a sandy road than on a concrete road because
Options:sand is soft and concreter is hard,    the friction between sand and feet is less than that between concrete and feet,    the friction between sand and feet is more than that between concrete and feet,    the sand is grainy but concrete is smooth

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3210 Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
Options:0.14 m/s,    140 m/s,    1.4 km/s,    14 m/s

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3211 Of the following properties of a wave, the one that is independent of the other is its
Options:amplitude,    velocity,    wavelength,    frequency

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3212 Lux is the SI unit of
Options:intensity of illumination,    luminous efficiency,    luminous flux,    luminous intensity

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3213 On a rainy day, small oil films on water show brilliant colours. This is due to
Options:dispersion,    interference,    diffraction,    polarization

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3214 Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Options:move towards A,    move towards B,    move at right angles to the line joining A and B,    remain at rest

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3215 Materials for rain-proof coats and tents owe their water-proof properties to
Options:surface tension,    viscosity,    specific gravity,    elasticity

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3216 RADAR is used for
Options:locating submerged submarines,    receiving a signals in a radio receiver,    locating geostationary satellites,    detecting and locating the position of objects such as aeroplanes

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3217 Sound of frequency below 20 Hz is called
Options:audio sounds,    infrasonic,    ultrasonic,    supersonics

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3218 On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
Options:mercury is a metal,    density of mercury is greater than that of water,    cohesion of mercury is greater than its adhesion with glass,    cohesion of water is greater than its adhesion with glass

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3219 Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Options:increase its life,    enable it to withstand higher voltages,    increase its electrical conductivity,    increase its electrical resistivity

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3220 Stars twinkle because
Options:the intensity of light emitted by them changes with time,    the distance of the stars from the earth changes with time,    the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time,    the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere

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3221 It takes much longer to cook food in the hills than in the plains, because
Options:in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time,    due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil,    in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere,    in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking

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3222 Moment of inertia is
Options:vector,    scalar,    phasor,    tensor

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3223 Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Options:Rainbow,    Earthshine,    Halo,    Mirage

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3224 Inside an aeroplane, flying at a high altitude,
Options:the pressure is the same as that outside,    normal atmospheric pressure is maintained by the use of air pumps,    the pressure inside is less than the pressure outside,    normal humidity and partial vacuum are maintained

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3225 Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Options:Water, iron and air,    Iron, air and water,    Air, water and iron,    Iron, water and air

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3226 One thousand microns is equal to
Options:10-3m,    10-6m,    10-9m,    10-12m

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3227 Sound travels at the fastest speed in
Options:steel,    water,    air,    vacuum

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3228 oil raise up the wick in a lamp. The principle involves
Options:the diffusion of oil through the wick,    the liquid state of oil,    capillary action phenomenon,    volatility of oil

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3229 Superconductors are substances which
Options:conduct electricity at low temperature,    offer high resistance to the flow of current,    offer no resistance to the flow of electricity,    conduct electricity at high temperatures

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3230 Light travels at the fastest speed in
Options:glass,    water,    hydrogen,    vacuum

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3231 Railway tracks are banked on curves
Options:necessary centrifugal force may be obtained from the horizontal component weight of the train,    to avoid frictional force between the tracks and wheels,    necessary centripetal force may be obtained from the horizontal component of the weight of the train,    the train may not fly off in the opposite direction

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3232 On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
Options:metals have higher thermal capacity than plastics,    plastics have a lower density than metals,    metals are good conductor of heat,    plastics have a higher thermal conductivity than metals

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3233 Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Options:1.8 km, 0.15 km,    2.2 km, 0.20 km,    2.8 km, 0.25 km,    3.3 km, 0.30 km

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3234 Intensity of sound at a point is ____ its distance from the source.
Options:directly proportional to,    inversely proportional to,    directly proportional to square of,    inversely proportional to square of

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3235 Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Options:at sea level,    at the top of Mt. Everest,    at a place in a valley below sea level,    in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

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3236 Radio telescopes are better than optical telescopes because
Options:they can detect faint galaxies which no optical telescope can,    they can work even in cloudy conditions,    they can work during the day and night,    All of the above

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3237 Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Options:X-rays,    ultraviolet light,    visible light,    radio waves

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3238 Out of the following pairs, which one does not have identical dimension?
Options:Moment of inertia and moment of a force,    Work and Torque,    Angular momentum and Planck's constant,    Impulse and Momentum

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