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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2551. |
Airplanes are run on a racetrack before taking off? |
| A. | to reduce working air pressure |
| B. | to increase working air pressure |
| C. | To reduce the friction force between the ground by the aircraft |
| D. | To increase the frictional force between the ground by the aircraft |
| Answer» C. To reduce the friction force between the ground by the aircraft | |
| 2552. |
What is the purpose of doing banking on the circular road? |
| A. | exert centrifugal force |
| B. | provide centripetal force |
| C. | provide angular velocity |
| D. | give centrifugal acceleration |
| Answer» C. provide angular velocity | |
| 2553. |
Food is cooked in a pressure cooker in less time, because . . . . . . |
| A. | Due to high pressure, the temperature of boiling water decreases. |
| B. | Being closed from all sides, there is no effect of wind. |
| C. | Due to high pressure, the temperature of boiling water rises. |
| D. | The evaporation of the used water is very less. |
| Answer» D. The evaporation of the used water is very less. | |
| 2554. |
The wall below the dam is made thick because . . . . . . . . |
| A. | With increasing depth, the pressure of the fluid increases. |
| B. | The pressure of the liquid decreases with increasing depth. |
| C. | The density of the liquid increases with increasing depth. |
| D. | The density of the liquid decreases with increasing depth. |
| Answer» B. The pressure of the liquid decreases with increasing depth. | |
| 2555. |
In an airplane, the ink comes out from the fountain pen because . . . . . . . |
| A. | air pressure decreases as altitude increases |
| B. | air pressure increases as altitude increases |
| C. | Air pressure remains unchanged as altitude increases |
| D. | none of the above |
| Answer» B. air pressure increases as altitude increases | |
| 2556. |
A boy sitting in an open car going at a constant speed throws the ball straight up in the air. does the ball fall? |
| A. | Behind him |
| B. | In front of him |
| C. | in his hand |
| D. | beside her |
| Answer» D. beside her | |
| 2557. |
When a boat enters the sea from a river. . . . . . . . . |
| A. | slightly rises up |
| B. | sinks a bit |
| C. | remains unchanged |
| D. | Rising or sinking depends on the material of the boat |
| Answer» B. sinks a bit | |
| 2558. |
A sudden drop in barometer readings is an indication that the weather is . . . . . . . |
| A. | will be still and calm |
| B. | It will be rainy |
| C. | will be cold |
| D. | will be stormy |
| Answer» E. | |
| 2559. |
If an object is moving in a straight line with a constant acceleration, the relationship between which of the following can be expressed by the equation? |
| A. | Speed |
| B. | displacement |
| C. | Time |
| D. | All of the above |
| Answer» E. | |
| 2560. |
Under the railway track, wide strips of wood or concrete are installed, so that . . . . . . . . |
| A. | he can absorb the shock |
| B. | To apply fish straps correctly |
| C. | keep the tracks parallel |
| D. | reduce the pressure exerted by the train |
| Answer» E. | |
| 2561. |
What force is used to remove cream from milk? |
| A. | centrifugal force |
| B. | centripetal force |
| C. | Frictional force |
| D. | external force |
| Answer» B. centripetal force | |
| 2562. |
The reason for the non-floating of a piece of iron on the water surface is? |
| A. | The weight of water displaced by iron is less than the weight of iron. |
| B. | The weight of water displaced by iron is greater than the weight of iron. |
| C. | The weight of water displaced by iron is equal to the weight of iron. |
| D. | It does not displace water. |
| Answer» B. The weight of water displaced by iron is greater than the weight of iron. | |
| 2563. |
An iron needle sinks in water but the ship floats. On what principle is it based? |
| A. | Pascal's theory |
| B. | Archimedes' theory |
| C. | Kepler's theory |
| D. | law of gravity |
| Answer» C. Kepler's theory | |
| 2564. |
When the bucket of water is rotated very fast in a vertical circle, the water does not fall from the bucket even from its highest position, because . . . |
| A. | centrifugal force is greater than the weight of water |
| B. | centrifugal force is less than the weight of water |
| C. | The weight of water is reduced at the highest position of the bucket |
| D. | The cohesive force between the water and the bucket is greater |
| Answer» B. centrifugal force is less than the weight of water | |
| 2565. |
Sometimes blood starts coming out of the nose and mouth of the people on the mountains, because . . . . . . . . . . . |
| A. | blood pressure increases with height |
| B. | blood pressure decreases with increase in height |
| C. | atmospheric pressure increases with increase in altitude |
| D. | Atmospheric pressure decreases with increasing altitude |
| Answer» E. | |
| 2566. |
When a brush is immersed in water, its hair sticks together. |
| A. | due to viscosity |
| B. | due to surface tension |
| C. | due to cohesion |
| D. | due to elasticity |
| Answer» C. due to cohesion | |
| 2567. |
A person trapped in a swamp is advised to lie down because . . . . . . . . . |
| A. | As the area increases, the pressure decreases. |
| B. | The greater the area, the greater the pressure. |
| C. | There is no relation between pressure and area |
| D. | for all the above reasons |
| Answer» B. The greater the area, the greater the pressure. | |
| 2568. |
The pressure inside the soap bubble. . . . . |
| A. | is greater than atmospheric pressure |
| B. | less than atmospheric pressure |
| C. | atmospheric pressure is equal to |
| D. | Is half of the atmospheric pressure |
| Answer» B. less than atmospheric pressure | |
| 2569. |
Why do small pieces of camphor dance on the surface of water? |
| A. | due to surface tension |
| B. | due to viscosity |
| C. | This is the property of camphor |
| D. | due to the density of water |
| Answer» B. due to viscosity | |
| 2570. |
There is no atmosphere on the moon, because . . . . . . . |
| A. | it's near the earth |
| B. | it orbits the sun |
| C. | it gets light from the sun |
| D. | Here the escape velocity of the atoms is less than their square mean root velocity. |
| Answer» E. | |
| 2571. |
The time taken for light to reach the Earth from the nearest star other than the Sun. . . . . . |
| A. | 4.2 seconds |
| B. | 42 seconds |
| C. | 2 years |
| D. | 42 years |
| Answer» D. 42 years | |
| 2572. |
A ball dropped from an artificial satellite revolving around the Earth. . . . . . |
| A. | will go to earth |
| B. | will go to the moon |
| C. | will fall to earth |
| D. | will continue to revolve around the earth in the same orbit with the same periodicity as the satellite |
| Answer» E. | |
| 2573. |
The weight of the person will be more in the lift which . . . . |
| A. | moves upward with a constant velocity |
| B. | moves down with a constant velocity |
| C. | accelerated upward |
| D. | accelerating downward |
| Answer» D. accelerating downward | |
| 2574. |
If the diameter of the capillary is doubled, then the height of the water surface climbing into it will be . . . . . |
| A. | doubles |
| B. | remains half |
| C. | stays the same |
| D. | goes to zero |
| Answer» C. stays the same | |
| 2575. |
It is harder to walk on snow than on a road with sand because . . . . . . . . . . |
| A. | Ice is soft and spongy, whereas scone is hard. |
| B. | The force of friction between the foot and the ice is less than the force of friction between the ball and the foot. |
| C. | The force of friction on ice is less than that of a ball. |
| D. | Here the escape velocity of the atoms is less than their square mean root velocity. |
| Answer» C. The force of friction on ice is less than that of a ball. | |
| 2576. |
Because of the sharper voice of women than that of men. . . . . . . . . |
| A. | have high frequency |
| B. | have high dimensions |
| C. | has low frequency |
| D. | Weak speech - fiber |
| Answer» B. have high dimensions | |
| 2577. |
Why does a swimmer find it easier to swim in sea water than in a river? |
| A. | less pollution in sea water |
| B. | Sea waves help swimmers to swim |
| C. | Density of sea water is higher than that of ordinary water |
| D. | The volume of water in the sea is high |
| Answer» D. The volume of water in the sea is high | |
| 2578. |
At what minimum velocity, when launched from the Earth's surface, will a rocket cross the Earth's gravity and go into space? |
| A. | 11.2 Km s |
| B. | 11 . 2 ms |
| C. | 11. 2 Km H |
| D. | 10 . 2 ms |
| Answer» B. 11 . 2 ms | |
| 2579. |
When a stone is brought from the surface of the moon to the earth, then . . . . . . . |
| A. | its mass will change |
| B. | Its weight will change, but mass will not |
| C. | both weight and mass will change |
| D. | neither mass nor weight will change |
| Answer» C. both weight and mass will change | |
| 2580. |
One horse power (HP) is equal to how many watts? |
| A. | 435 watts |
| B. | 305 watts |
| C. | 746 watts |
| D. | 976 watts |
| Answer» D. 976 watts | |
| 2581. |
When a person enters a dark room with bright light outside, he will not be able to see clearly for some time. this is due to ? |
| A. | not being able to adjust the eye quickly |
| B. | momentary retinal insensitivity |
| C. | iris inability to dilate the pupil immediately |
| D. | delay in adjusting the gap between lens and retina |
| Answer» D. delay in adjusting the gap between lens and retina | |
| 2582. |
A runner runs for some distance before making a long jump, because . . . . . . . |
| A. | running makes it easier to jump |
| B. | it makes his body warm |
| C. | The motion of his body while jumping - inertia helps him to cover a greater distance |
| D. | He doesn't slip while jumping |
| Answer» D. He doesn't slip while jumping | |
| 2583. |
Energy stored in the clock spring. . . . . |
| A. | kinetic energy |
| B. | potential energy |
| C. | thermal energy |
| D. | chemical energy |
| Answer» C. thermal energy | |
| 2584. |
After the rain stopped, the rainbow . . . . |
| A. | looking towards the sun |
| B. | appears on the opposite side of the sun |
| C. | It is visible in any direction, not based on the position of the sun |
| D. | visible even when there is no sun |
| Answer» C. It is visible in any direction, not based on the position of the sun | |
| 2585. |
The absorption of ink by blotting paper is involved in? |
| A. | ink viscosity |
| B. | capillary reaction phenomenon |
| C. | Diffusion through blotting |
| D. | siphon action |
| Answer» C. Diffusion through blotting | |
| 2586. |
Energy conservation means that . . . . . . . |
| A. | Energy is created and destroyed |
| B. | Energy can be created, not destroyed |
| C. | Energy cannot be created, but it can be destroyed |
| D. | Energy can neither be created nor destroyed |
| Answer» E. | |
| 2587. |
The sun remains visible for some time even after it has sunk below the horizon. The reason . . . . . |
| A. | Atmospheric refraction |
| B. | light scattering |
| C. | character test |
| D. | remains of sight |
| Answer» B. light scattering | |
| 2588. |
The formation of a rainbow is the formation of light by the water droplets present in the atmosphere. . . . . |
| A. | dispersion is |
| B. | scattering is |
| C. | total internal reflection is |
| D. | both dispersion and total internal reflection |
| Answer» E. | |
| 2589. |
A liquid rises to a higher height than water in a capillary, because of this? |
| A. | It is more viscous than liquid water. |
| B. | The temperature of a liquid is higher than that of water. |
| C. | The surface tension of a liquid is less than that of water. |
| D. | The surface tension of a liquid is greater than that of water. |
| Answer» E. | |
| 2590. |
Oil spreads over water because . . . . . . . |
| A. | oil is denser than water |
| B. | Oil is rarer than water |
| C. | The surface tension of oil is greater than that of water |
| D. | The surface tension of oil is less than that of water |
| Answer» E. | |
| 2591. |
The feeling of weightlessness in a spacecraft in orbit is due to |
| A. | absence of external gravity |
| B. | The acceleration in orbit is equal to the acceleration due to external gravity |
| C. | external gravity, but not inside the spacecraft |
| D. | lack of energy in the spacecraft in orbit |
| Answer» C. external gravity, but not inside the spacecraft | |
| 2592. |
A geostationary satellite moves continuously in its orbit. This happens due to the effect of centrifugal force, which is obtained? |
| A. | satellite propellant rocket engine |
| B. | Earth's gravity on the satellite |
| C. | gravity exerted by the sun on the satellite |
| D. | Earth's gravity by satellite |
| Answer» C. gravity exerted by the sun on the satellite | |
| 2593. |
What part of the Sun is visible in a total solar eclipse? |
| A. | no part |
| B. | kirit |
| C. | chromosphere |
| D. | circle of light |
| Answer» C. chromosphere | |
| 2594. |
The part of a pencil partially dipped diagonally in water - |
| A. | It appears to be bent towards the bottom. |
| B. | Appears to be bent towards the surface of the water. |
| C. | The crooked ridge appears to be bent. |
| D. | A downward curve is visible. |
| Answer» C. The crooked ridge appears to be bent. | |
| 2595. |
An egg sinks in soft water, but floats in a concentrated solution of salt, because . . . . . |
| A. | The egg absorbs salt from the solution and expands |
| B. | The albumin is dissolved in the salt solution and the egg becomes lighter. |
| C. | The density of the salt solution becomes greater than the density of the egg |
| D. | the surface tension of water is high |
| Answer» D. the surface tension of water is high | |
| 2596. |
When butter is taken out of milk. . . . . |
| A. | Increases the density of milk |
| B. | the density of milk decreases |
| C. | Density remains unchanged |
| D. | none of the above |
| Answer» B. the density of milk decreases | |
| 2597. |
Weightlessness? |
| A. | zero state of gravity |
| B. | when gravity decreases |
| C. | in a state of vacuum |
| D. | none of these |
| Answer» B. when gravity decreases | |
| 2598. |
When two capillary tubes of different diameters are immersed vertically in a liquid, then the height of the liquid ascended when immersed is . . . . . . . |
| A. | will be equal in both capillaries |
| B. | Larger diameter capillary will have more |
| C. | A capillary with a smaller diameter will have more |
| D. | depends on the mass of water |
| Answer» D. depends on the mass of water | |
| 2599. |
The ball keeps on dancing in the water splash at the intersections, because . . . . . . . . . |
| A. | The pressure decreases as the velocity of the water increases |
| B. | As the velocity of the water increases, the pressure increases |
| C. | due to surface tension of water |
| D. | due to water viscosity |
| Answer» B. As the velocity of the water increases, the pressure increases | |
| 2600. |
weight of a body. . . . . . . |
| A. | is the same everywhere on the earth |
| B. | is highest at the poles |
| C. | higher at the equator |
| D. | It is felt if the mountains are pulled higher than the plains |
| Answer» C. higher at the equator | |