MCQOPTIONS
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MCQOPTIONS
This section includes 2016 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
If the power of an object is expressed in terms of Dioptre, then the object must be a/an _____. |
| A. | Electrical furnace |
| B. | Automobile engine |
| C. | Lens |
| D. | Jet engine |
| Answer» D. Jet engine | |
| 652. |
In thermometers, usually mercury is used for a broad range of temperature measurements but in very cold countries alcohol is used in the thermometers. This is because of which of the following reasons? |
| A. | Alcohol has high boiling point |
| B. | It will not stick to the glass |
| C. | It freezing point is very low. |
| D. | Alcohol is a poor conductor of heat. |
| Answer» D. Alcohol is a poor conductor of heat. | |
| 653. |
Earth’s surface re-emits heat in the form of _________. |
| A. | Ultraviolet rays |
| B. | infrared radiation |
| C. | gamma rays |
| D. | radio waves |
| Answer» C. gamma rays | |
| 654. |
A body of mass 3 kg accelerates from 10 m/s to 20 m/s in 5 seconds due to the application of a force on it. Calculate the magnitude of this force (in N). |
| A. | 6 |
| B. | 18 |
| C. | 12 |
| D. | 36 |
| Answer» B. 18 | |
| 655. |
1 kWh = ________ × 106 J. |
| A. | 36 |
| B. | 3.6 |
| C. | 6.4 |
| D. | 64 |
| Answer» C. 6.4 | |
| 656. |
Calculate the pressure (in Pa) if a thrust of 1000 N is applied to an area of 5 m2. |
| A. | 200 |
| B. | 50 |
| C. | 100 |
| D. | 25 |
| Answer» B. 50 | |
| 657. |
As a sailor jumps in the forward direction, the boat moves backwards. This example illustrates Newton's: |
| A. | Second Law of Motion |
| B. | First and Second Law of Motion |
| C. | Third Law of Motion |
| D. | First Law of Motion |
| Answer» D. First Law of Motion | |
| 658. |
Bending of light at the boundary between two media is the effect of ________. |
| A. | Scattering |
| B. | Reflection |
| C. | Refraction |
| D. | Diffusion |
| Answer» D. Diffusion | |
| 659. |
A bullet of mass 10 g is fired with a velocity of 20 m/s from a gun of mass 2 kg. Find the recoil velocity (in m/s) of the gun. |
| A. | 1 |
| B. | 0.2 |
| C. | 0.1 |
| D. | 2 |
| Answer» D. 2 | |
| 660. |
After 5 billion years our sun will become a red giant. If the core temperature of the red giant increases to 108 K again, energy can be produced through fusion once more by using ____________ to make carbon. |
| A. | lithium |
| B. | helium |
| C. | hydrogen |
| D. | protons |
| Answer» C. hydrogen | |
| 661. |
_____ is the unit of thermal conductivity. |
| A. | J⋅ s-1⋅ m-1⋅ K-1 |
| B. | J⋅ s⋅ K |
| C. | J-1⋅ s-1⋅ Kg-1 |
| D. | J⋅ s-1⋅ K |
| Answer» B. J⋅ s⋅ K | |
| 662. |
Arrange the following substance in increasing order of forces of attraction between the particles (A) Water, (B) Wax, (C) Nitrogen |
| A. | Nitrogen, Water, Wax |
| B. | Wax, Water, Nitrogen |
| C. | Water, Wax, Nitrogen |
| D. | Nitrogen, Wax, Water |
| Answer» B. Wax, Water, Nitrogen | |
| 663. |
An instrument called the ______ measures the electric current in a circuit. |
| A. | Ammeter |
| B. | Ohmmeter |
| C. | Thermometer |
| D. | Gyroscope |
| Answer» B. Ohmmeter | |
| 664. |
2500 Watts = ________ kW |
| A. | 250 |
| B. | 0.25 |
| C. | 25 |
| D. | 2.5 |
| Answer» E. | |
| 665. |
A radioactive element has a half life of 25 hours. After what time will 1/8 th of the initial number of atoms disintegrate? |
| A. | 4 hours 49 minutes |
| B. | 30 hours 41 minutes |
| C. | 0.5 minutes |
| D. | 48 hours 1 minutes |
| Answer» B. 30 hours 41 minutes | |
| 666. |
In a certain region, a uniform magnetic field exists in the direction from south to north. An electron enters the field from east to west. The force experienced by the electron due to the field is |
| A. | towards north |
| B. | towards east |
| C. | upwards |
| D. | downwards |
| Answer» D. downwards | |
| 667. |
Name the type of mirror used in the headlight of vehicles: |
| A. | Plane mirror |
| B. | Concave mirror |
| C. | Convex mirror |
| D. | Plano-convex mirror |
| Answer» C. Convex mirror | |
| 668. |
1kW = ? |
| A. | 1000 W |
| B. | 10 W |
| C. | 100 W |
| D. | 10000 W |
| Answer» B. 10 W | |
| 669. |
If 64 raindrops combine into a single big drop, then ratio of the total surface energy of the 64 drops to that of a single big drop is |
| A. | 16 ∶ 1 |
| B. | 8 ∶ 1 |
| C. | 4 ∶ 1 |
| D. | 1 ∶ 1 |
| Answer» D. 1 ∶ 1 | |
| 670. |
'Ampere' is the measurement unit of which of the following? |
| A. | Energy |
| B. | temperature |
| C. | Speed |
| D. | Electric Current |
| Answer» E. | |
| 671. |
A block placed on an inclined plane of slope angle θ slides down at a constant speed. The coefficient of kinetic friction is equal to ________. |
| A. | sin θ |
| B. | cos θ |
| C. | tan θ |
| D. | cot θ |
| Answer» D. cot θ | |
| 672. |
______ are also known as heat waves. |
| A. | X-rays |
| B. | Gamma rays |
| C. | Light waves |
| D. | Infra-red waves |
| Answer» E. | |
| 673. |
In a photovoltaic cell which type of energy gets converted into electrical energy? |
| A. | Chemical |
| B. | Light |
| C. | Sound |
| D. | Magnetic |
| Answer» C. Sound | |
| 674. |
On a hot summer afternoon, the tent made up of fabric will be preferred as white colour is: |
| A. | A good absorber and bad reflector of heat |
| B. | A bad absorber and good reflector of heat |
| C. | Neither an absorber nor good reflector of heat |
| D. | A conductor of heat |
| Answer» C. Neither an absorber nor good reflector of heat | |
| 675. |
In which of the following mentioned activities is the potential energy (P.E.) converted into kinetic energy (K.E.)? |
| A. | The explosion of a fire cracker |
| B. | The switching on of a torch |
| C. | The switching off of a torch |
| D. | The swinging of a pendulum |
| Answer» E. | |
| 676. |
According to modern electron theory, an atom is made up of proton, neutron, and electron. Among 3 elements ___________ is considered to be neutral in nature (i.e) contains no charge ? |
| A. | Neutrons |
| B. | Protons |
| C. | Electrons |
| D. | Both Neurons and Protons |
| Answer» B. Protons | |
| 677. |
A bullet, of mass 20 g, is horizontally fired with a velocity 150 ms-1 from a pistol of mass 2.5 kg. What is the recoil velocity of the pistol? |
| A. | - 1.25 ms-1 |
| B. | -1.5 ms-1 |
| C. | -1.2 ms-1 |
| D. | -2.0 ms-1 |
| Answer» D. -2.0 ms-1 | |
| 678. |
Half life of Fermium-253 is 3 days. How many days will it take for 2gm of Fermium to become 0.125gm? |
| A. | 24 |
| B. | 6 |
| C. | 3 |
| D. | 12 |
| Answer» E. | |
| 679. |
Hydraulic brakes used in automatic vehicles is direct virtual application of which law? |
| A. | Pascal's law |
| B. | Archimedes’' principle |
| C. | Newton's law |
| D. | Boyle's law |
| Answer» B. Archimedes’' principle | |
| 680. |
A thermometer is used to measure ______. |
| A. | heat |
| B. | thermal inductance |
| C. | fire |
| D. | temperature |
| Answer» E. | |
| 681. |
During an object's free fall, which of the following energies increases at one point in its path? |
| A. | Kinetic energy |
| B. | Chemical energy |
| C. | Potential energy |
| D. | Mechanical energy |
| Answer» B. Chemical energy | |
| 682. |
Bats search out prey and fly in dark night by emitting and detecting reflections of which type of Sound Waves? |
| A. | Ultrasonic Waves |
| B. | Sonic Waves |
| C. | Subsonic Waves |
| D. | Hypersonic Waves |
| Answer» B. Sonic Waves | |
| 683. |
Electric fuse is connected_________. |
| A. | across the energy meter |
| B. | on the live wire |
| C. | on the neutral wire |
| D. | on the earth wire |
| Answer» C. on the neutral wire | |
| 684. |
A bus travelling at a speed of 54 km/h speeds up to 72 km/h in 5 seconds. Calculate the acceleration of the bus. |
| A. | 15 m/s2 |
| B. | 18 m/s2 |
| C. | 1 m/s2 |
| D. | 20 m/s2 |
| Answer» D. 20 m/s2 | |
| 685. |
If the speed of a cycle become two times, then the kinetic energy becomes ________. |
| A. | 2 times |
| B. | 4 times |
| C. | 8 times |
| D. | 16 times |
| Answer» C. 8 times | |
| 686. |
Calculate the mass defect in (in u) an atom of 9Be4 of atomic mass 9.0122 u. (masses of neutron, proton and electron are 1.00866 u, 1.00727 u and 0.00055 u respectively) |
| A. | 0.124759 |
| B. | 0.187139 |
| C. | 0.031189 |
| D. | 0.062379 |
| Answer» E. | |
| 687. |
Dynamic characteristic of instruments leading to variations during measurement are:1. Speed of response2. Fidelity3. Dynamic errorWhich of the above are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 688. |
Faraday constant |
| A. | depends on the amount of the electrolyte |
| B. | depends on the current passed in the electrolyte |
| C. | depends on the volume of the solvent in which the electrolyte is dissolved |
| D. | is a universal constant |
| E. | None of the above / More than one of the above |
| Answer» E. None of the above / More than one of the above | |
| 689. |
By the use of photovoltaic cell while converting solar energy which of the following is produced? |
| A. | Light energy |
| B. | Electric energy |
| C. | Chemical energy |
| D. | Heat energy |
| Answer» C. Chemical energy | |
| 690. |
More density of the particles in the medium through which sound travels, creates more __________ and vice versa. |
| A. | Pressure |
| B. | Energy |
| C. | Power |
| D. | Force |
| Answer» B. Energy | |
| 691. |
A device used to test whether an object is carrying a charge or not is known as ________. |
| A. | Stethoscope |
| B. | Coulomb device |
| C. | Electrostatic device |
| D. | Electroscope |
| Answer» E. | |
| 692. |
Einstein gave the theory of relativity as ________. |
| A. | E = mc2 |
| B. | ρ = mv |
| C. | F = ma |
| D. | PE = mgh |
| Answer» B. ρ = mv | |
| 693. |
Nm-2 is the SI unit of: |
| A. | Pressure |
| B. | Work |
| C. | Power |
| D. | Force |
| Answer» B. Work | |
| 694. |
Conduction and convection modes of heat transfer CANNOT operate between bodies separated by _________. |
| A. | water |
| B. | aluminium |
| C. | vacuum |
| D. | ice |
| Answer» D. ice | |
| 695. |
A train, starting from rest, attains a velocity of 90 km/h in 5 minutes. Assuming that the acceleration is uniform, the distance travelled by the train during this time is: |
| A. | 1.5 km |
| B. | 3.25 km |
| C. | 2.25 km |
| D. | 3.75 km |
| Answer» E. | |
| 696. |
Latent heat corresponds to the change in heat at constant |
| A. | temperature |
| B. | volume |
| C. | pressure |
| D. | temperature, volume and pressure |
| Answer» B. volume | |
| 697. |
An object of mass 20 kg is moving with a uniform velocity of 8 ms-1. The kinetic energy possessed by the object is: |
| A. | 640 ms-1 |
| B. | 640 Pa |
| C. | 640 N |
| D. | 640 J |
| Answer» E. | |
| 698. |
According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the _________ of an object. |
| A. | Density |
| B. | Volume |
| C. | Force |
| D. | Mass |
| Answer» E. | |
| 699. |
40Ar18 and 38Ar18 are examples of? |
| A. | isotopes |
| B. | isobars |
| C. | isomers |
| D. | isotones |
| Answer» B. isobars | |
| 700. |
An electric bell is placed inside a bell jar which is closed air tight. If the bell is ringing and the air is slowly removed with the help of a vacuum pump, then: |
| A. | The amplitude of vibration of the air column decreases |
| B. | The number of vibration of the air column decreases |
| C. | The number of vibration of the striker decreases |
| D. | The number of vibration of the striker increases |
| Answer» B. The number of vibration of the air column decreases | |