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MCQOPTIONS
This section includes 1292 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
A nuclear reactor is said to have become 'critical' when |
| A. | it stops due to malfunctioning |
| B. | it starts emitting dangerous radioactive radiations |
| C. | it is shut down to avoid explosion |
| D. | it is ready to produce controlled energy |
| Answer» E. | |
| 852. |
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct? |
| A. | The wavelength of X-ray photon is less than the wavelength of visible radiation photon. |
| B. | Both  the  photons  have  different energies. |
| C. | The speeds of both the photons in vacuum are different |
| D. | The  frequency  of  X-ray  photon  is higher than the frequency of visible radiation photon. |
| Answer» D. The  frequency  of  X-ray  photon  is higher than the frequency of visible radiation photon. | |
| 853. |
A  parallel-plate  capacitor,with  air  in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become |
| A. | C |
| B. | C/7 |
| C. | 7C |
| D. | 14C |
| Answer» D. 14C | |
| 854. |
A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s] |
| A. | 1568 J |
| B. | 1568 C |
| C. | 1568 W |
| D. | 1568 N |
| Answer» B. 1568 C | |
| 855. |
A manometer is used to measure |
| A. | earthquake |
| B. | pressure |
| C. | temperature |
| D. | density |
| Answer» C. temperature | |
| 856. |
A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | first increases and then decreases |
| Answer» D. first increases and then decreases | |
| 857. |
A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of __________ . |
| A. | gravitational force between train and man |
| B. | illusion of the man |
| C. | the centripetal force |
| D. | pressure difference due to fast moving air in between |
| Answer» E. | |
| 858. |
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is |
| A. | greater than the weight of the man |
| B. | less than the weight of the man |
| C. | Same as the weight of the man |
| D. | Zero |
| Answer» B. less than the weight of the man | |
| 859. |
A man lifts a luggage of 25 kg from the ground and puts it on the head, 2.5 m above the ground. If the value of g = 10 m/s2, then the value of work done by him on the luggage is |
| A. | 22.5 J |
| B. | 225 J |
| C. | 625 J |
| D. | 220 J |
| Answer» D. 220 J | |
| 860. |
A lens has a power +2.0 D. The type of lens and its focal length will be |
| A. | Concave, -0.5 m |
| B. | Convex, 0.5 m |
| C. | Concave, 0.5 m |
| D. | Convex, -0.5 m |
| Answer» C. Concave, 0.5 m | |
| 861. |
A machine powered by rotating blades is a |
| A. | Fumerole |
| B. | Turbines |
| C. | Solar panel |
| D. | None of the above |
| Answer» C. Solar panel | |
| 862. |
A man jumping out of a moving train is thrown |
| A. | forward |
| B. | backward |
| C. | sidewaqys |
| D. | None of these |
| Answer» B. backward | |
| 863. |
A lemon kept in water in a glass tumbler appears to be bigger than its actual size when viewed from the sides. This is because of |
| A. | reflection of light |
| B. | internal reflection of light |
| C. | refraction of light |
| D. | diffraction of light |
| Answer» D. diffraction of light | |
| 864. |
A kilowatt-hour is unit of |
| A. | Power |
| B. | Electric charge |
| C. | Energy |
| D. | Electric current |
| Answer» D. Electric current | |
| 865. |
A hunter on the ground wishes to shoot a  bird on a tree at a distance with his rifle. He has to point the rifle |
| A. | at the lower alevation than the bird |
| B. | at a higher alevation than the bird |
| C. | In the same direction as the bird |
| D. | vertically upwards |
| Answer» C. In the same direction as the bird | |
| 866. |
A high jumper runs for a while before taking a high jump so that the inertia of __ helps him take the long jump. |
| A. | rest |
| B. | shape |
| C. | motion |
| D. | direction |
| Answer» D. direction | |
| 867. |
A galvanometer can be converted to a voltmeter by connecting |
| A. | a high resistance in parallel |
| B. | a high resistance in series |
| C. | a low resistance in series |
| D. | a low resistance in parallel |
| Answer» C. a low resistance in series | |
| 868. |
A generator converts |
| A. | mechanical energy into electrical energy. |
| B. | electrical energy into chemical energy. |
| C. | thermal energy into electrical energy. |
| D. | electrical energy into light energy. |
| Answer» B. electrical energy into chemical energy. | |
| 869. |
A gradual increase in loudness is known as |
| A. | Crescendo |
| B. | Timbre |
| C. | Fortissimo |
| D. | None of the above |
| Answer» B. Timbre | |
| 870. |
A good cricket fielder while catching a fast moving ball moves his hand along with the ball because ___. |
| A. | He decreases the time of contact therefore increasing the force of contact |
| B. | He increases the time of contact thereby reducing the force of contact |
| C. | He is afraid to take the ball and thus takes his hand out. |
| D. | He decreases the time of contact therefore reducing the force of contact |
| Answer» C. He is afraid to take the ball and thus takes his hand out. | |
| 871. |
A galvanometer can be converted into a voltmeter by connecting with it a |
| A. | high resistance in parallel |
| B. | low resistance on parallel |
| C. | high resistance on series |
| D. | low resistance in series |
| Answer» D. low resistance in series | |
| 872. |
A force of 200 N displaces a body by 4 m, calculate the work done (in J). |
| A. | 40 |
| B. | 500 |
| C. | 80 |
| D. | 800 |
| Answer» E. | |
| 873. |
A Fuse is used in mains electric supply as a safety devices. Which one of the following statements about the fuse is correct? |
| A. | It is connected in parallel with the main switch |
| B. | It is made mainly from silver alloys |
| C. | It must have a low melting point |
| D. | It must have a very high resistance |
| Answer» D. It must have a very high resistance | |
| 874. |
A forensic tool used to identify the chemical makeup?_x005F_x000D_ |
| A. | calibur |
| B. | lie detector |
| C. | gas chromatograph |
| D. | ballistics |
| Answer» D. ballistics | |
| 875. |
A force of 20 N displaces an object through 2 m and does a work of 20 J. The angle between the force and displacement is |
| A. | 60 deg |
| B. | 0 deg |
| C. | 90 deg |
| D. | 30 deg |
| Answer» B. 0 deg | |
| 876. |
A fixture is defined as a device which |
| A. | is used to check the accuracy of workpiece |
| B. | holds and locates a workpiece and guides and controls one or more cutting tools |
| C. | holds and locates a workpiece during an inspection or for a manufacturing operation |
| D. | All of the above |
| Answer» C. holds and locates a workpiece during an inspection or for a manufacturing operation | |
| 877. |
A doppler effect occurs when a source of sound moves |
| A. | away from you |
| B. | towards you |
| C. | Both A & B |
| D. | None of the above |
| Answer» D. None of the above | |
| 878. |
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ? |
| A. | Depends on their masses |
| B. | Sphere |
| C. | Disk |
| D. | Both reach at the same time |
| Answer» C. Disk | |
| 879. |
A device G.M counter is used for the measurement of which of the following?_x005F_x000D_ |
| A. | Speed of air_x005F_x000D_ |
| B. | Mass number |
| C. | Radioactivity |
| D. | Valence |
| Answer» D. Valence | |
| 880. |
A cyclist leans inwards when he is negotiating a curve so that |
| A. | he may increase his speed |
| B. | his weight may be reduced |
| C. | necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion. |
| D. | no frictional force may be produced between the wheels and the axle |
| Answer» D. no frictional force may be produced between the wheels and the axle | |
| 881. |
A curved mirror where the reflecting surface is curved inwards is called a |
| A. | Concave mirror |
| B. | Plano-convex mirror |
| C. | Plane mirror |
| D. | Convex mirror |
| Answer» B. Plano-convex mirror | |
| 882. |
A current I flows through a resistor. A source maintains a potential difference of V across the resistor. The energy supplied by the source in time t is |
| A. | VÂ IÂ t2 |
| B. | V I |
| C. | V I t |
| D. | V I/t |
| Answer» D. V I/t | |
| 883. |
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat? |
| A. | conduction and convection only |
| B. | conduction and radiation only |
| C. | convection and radiation only |
| D. | conduction, convection and radiation |
| Answer» E. | |
| 884. |
A covex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be : |
| A. | f |
| B. | (4/3)f |
| C. | (3/4)f |
| D. | (7/3)f |
| Answer» B. (4/3)f | |
| 885. |
A copper wire of radius r and length lhas a resistance of R. A second copper wire with radius 2r and length lis taken and the two wires are joined in a parallel combination. The resultant resistance  of the parallel combination of the two wires will be |
| A. | 5 R |
| B. | 5 R/4 |
| C. | 4 R/5 |
| D. | R/5 |
| Answer» E. | |
| 886. |
A convex mirror is used to form an image of a real object. The image |
| A. | is diminished in size |
| B. | is erect |
| C. | always lies between the pole and the focus |
| D. | all of the above |
| Answer» E. | |
| 887. |
A conductor having some appreciable resistance is called a |
| A. | Resistor |
| B. | Insulator |
| C. | Conductor |
| D. | Semi-conductor |
| Answer» B. Insulator | |
| 888. |
A compressed spring possesses more energy than a spring of normal length because the compressed spring has |
| A. | chemical energy |
| B. | potential energy |
| C. | heat energy |
| D. | kinetic energy |
| Answer» C. heat energy | |
| 889. |
A convex lens has a focal length of 50 cm. Calculate its power. |
| A. | 4D |
| B. | 2D |
| C. | 1D |
| D. | 3D |
| Answer» C. 1D | |
| 890. |
A compressed spring possesses:_x005F_x000D_ |
| A. | Electric energy |
| B. | Potential energy |
| C. | Kinetic energy |
| D. | Chemical energy |
| Answer» C. Kinetic energy | |
| 891. |
A certain household has consumed 320 units of energy during a month. How much energy is this in joules?_x005F_x000D_ |
| A. | 9 x 108 J |
| B. | 5 x 108 J |
| C. | 10Â XÂ 105Â J |
| D. | 1152 x 106 J |
| Answer» E. | |
| 892. |
A car parked in the sun with its windows closed gets terribly hot inside. This is due to |
| A. | the heat emitted by the engine |
| B. | the greenhouse effect |
| C. | the good conducting power of the metal body |
| D. | the double layered wind shield |
| Answer» C. the good conducting power of the metal body | |
| 893. |
A charge of 2 C passes from one point to the other in a circuit. If the potential difference between the two points is 5 V, the amount of work done is |
| A. | 5 J |
| B. | 10 J |
| C. | 2.5 J |
| D. | 0.4 J |
| Answer» C. 2.5 J | |
| 894. |
A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/sq.s) is: |
| A. | 3 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» B. 5 | |
| 895. |
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by |
| A. | decreasing the radius of the capillary tube |
| B. | increasing the radius of the capillary tube |
| C. | increasing the height of water in the vessel |
| D. | None of these |
| Answer» B. increasing the radius of the capillary tube | |
| 896. |
A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun. |
| A. | 2 |
| B. | 0.1 |
| C. | 4 |
| D. | 0.05 |
| Answer» E. | |
| 897. |
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the the bucket. The reading of the spring balance |
| A. | will increase |
| B. | will decrease |
| C. | does not change |
| D. | varies with the increase of depth of the immersion of the iron piece |
| Answer» B. will decrease | |
| 898. |
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity  water rises in the tube. The height of water rise in the tube can be increased by |
| A. | decreasing the radius of the capillary tube |
| B. | increasing the radius of the capillary tube |
| C. | increasing the height of water in the vessel |
| D. | None of these |
| Answer» B. increasing the radius of the capillary tube | |
| 899. |
A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 , the velocity with which the stone hits the ground is:_x005F_x000D_ |
| A. | 10 m/s |
| B. | 20 m/s |
| C. | 15 m/s |
| D. | 25 m/s |
| Answer» C. 15 m/s | |
| 900. |
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be |
| A. | a parabola |
| B. | a circle |
| C. | a horizontal straight line |
| D. | a vertical straight line |
| Answer» B. a circle | |