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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
The weight of on object on the earth is 60 N. What will be its weight on the moon? |
| A. | 10 N |
| B. | 6 N |
| C. | 1.6 N |
| D. | 1.2 N |
| E. | None of these |
| Answer» B. 6 N | |
| 852. |
A stone is allowed to fall from the top of the tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. The two stones will meet above the ground at height of |
| A. | 20 m |
| B. | 10.2 m |
| C. | 11.2 m |
| D. | 15.5m |
| Answer» B. 10.2 m | |
| 853. |
If masses of two bodies are halved and the distance between them is doubled, what effect do they have on the gravitational force between the masses? |
| A. | 1/16 F |
| B. | 1/8 F |
| C. | 2 F |
| D. | F |
| E. | None of these |
| Answer» B. 1/8 F | |
| 854. |
Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong? |
| A. | It is a freely falling body. |
| B. | It is moving with constant speed. |
| C. | It is acted upon by a force directed away from the centre of the earth which counter balances the gravitational pull |
| D. | Its angular momentum remains constant |
| Answer» D. Its angular momentum remains constant | |
| 855. |
A man drops a pencil from a height 2 m. With what speed does it strike the ground? |
| A. | 63 m/s |
| B. | 6.5 m/s |
| C. | 6.26 m/s |
| D. | 6.9 m/s |
| E. | None of these |
| Answer» D. 6.9 m/s | |
| 856. |
Gravitational force which acts on 1 kg is |
| A. | 9.8 N |
| B. | \[\frac{1}{9.8}N\] |
| C. | 980N |
| D. | none of these |
| Answer» B. \[\frac{1}{9.8}N\] | |
| 857. |
\[SI\] unit of weight is |
| A. | kg wt |
| B. | N |
| C. | g wt |
| D. | none of these |
| Answer» C. g wt | |
| 858. |
The acceleration due to gravity |
| A. | has the same value everywhere in space |
| B. | has the same value everywhere on the earth |
| C. | varies with the latitude on the earth |
| D. | is greater on the moon due to its smaller diameter |
| Answer» D. is greater on the moon due to its smaller diameter | |
| 859. |
____ is the measures of inertia of a body. |
| A. | Weight |
| B. | Mass |
| C. | Inertia |
| D. | Time |
| E. | None of these |
| Answer» C. Inertia | |
| 860. |
Ratio of the radius of the earth to that of the moon is 10. Ratio of g on the earth to the moon is 6. Then ratio of the escape velocity from the earth's surface to that from the moon is approximately |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 8 |
| Answer» D. 8 | |
| 861. |
Few characteristics of a quantity are given below. Find out the name of the quantity. (i) It is zero at the centre of the earth. (ii) It is measures with a spring balance. (iii) It is a vector quantity. (iv) It's direction is towards the centre of the earth. |
| A. | Pressure |
| B. | Weight |
| C. | Mass |
| D. | Kilogram |
| E. | None of these |
| Answer» C. Mass | |
| 862. |
The value of gravitational intensity of the centre of the earth is |
| A. | 1 |
| B. | infinity |
| C. | zero |
| D. | none of these |
| Answer» D. none of these | |
| 863. |
Three balls P, Q and R are kept in a straight line. The separation between P and R is 1m, and Q is placed at the midpoint between them. The masses of P, Q, R are 200 g, 300 g and 400 g respectively. Find the net gravitational force on P, Q and R respectively. |
| A. | \[2.13\times {{10}^{-11}}N,\,4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N\] |
| B. | \[4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N,\,8.28\times {{10}^{-13}}N\] |
| C. | \[5.20\times {{10}^{-12}}N,\,7.63\times {{10}^{-11}}N,\,6.23\times {{10}^{-11}}N\] |
| D. | \[2.13\times {{10}^{-11}}N,\,4.80\times {{10}^{-11}}N,\,6.52\times {{10}^{-12}}N\] |
| E. | None of these |
| Answer» B. \[4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N,\,8.28\times {{10}^{-13}}N\] | |
| 864. |
The mass of the Jupiter is \[\text{1}\text{.9 }\times \text{ 1}0\text{27}\]kg and that of the sun is \[\text{1}\text{.99 }\times \text{ 1}0\text{38}\] kg. The mean distance of the Jupiter from the sun is \[\text{7}\text{.8 }\times \text{ 1}0\text{11}\] m. Speed of the Jupiter is (assuming that Jupiter moves in a circular orbit around the sun) |
| A. | \[\text{1}\text{.3}0\text{4 }\times \text{ 1}{{0}^{\text{4}}}\text{m}/\text{sec}\] |
| B. | \[\text{13}.0\text{4 }\times \text{1}{{\text{0}}^{4}}\text{m}/\text{sec}\] |
| C. | \[\text{1}\text{.3}0\text{4 }\times \text{1}{{\text{0}}^{\text{6}}}\text{m}/\text{sec}\] |
| D. | \[1.304\,\times {{10}^{2}}m/sec\] |
| Answer» B. \[\text{13}.0\text{4 }\times \text{1}{{\text{0}}^{4}}\text{m}/\text{sec}\] | |
| 865. |
When the distance between two objects is increased, the force of attraction between them will: |
| A. | Decrease |
| B. | Increase |
| C. | Either [a] or [b] |
| D. | Do not change |
| E. | None of these |
| Answer» B. Increase | |
| 866. |
Match the following: Column A Column B (i) Gravity [A] Forces involved are very small. (ii) Gravitation [B] Matter contained in a body. (iii) Weight [C] S. I involved are large. (iv) Mass [D] Forces involved are large. |
| A. | (i - A), (ii - D), (iii - B), (iv - C) |
| B. | (i - D), (ii - A), (iii - B), (iv - C) |
| C. | (i - D), (ii - A), (iii - C), (iv - B) |
| D. | (i - A), (ii - C), (iii - D), (iv - B) |
| E. | None of these |
| Answer» D. (i - A), (ii - C), (iii - D), (iv - B) | |
| 867. |
SI unit of G is \[\text{N}{{\text{m}}^{\text{2}}}\]\[\text{k}{{\text{g}}^{-\text{2}}}\]. Which of the following can also be used as the SI unit of G? |
| A. | \[{{m}^{3}}k{{g}^{-1}}{{s}^{-2}}\] |
| B. | \[{{m}^{3}}k{{g}^{-2}}{{s}^{-1}}\] |
| C. | \[\text{m k}{{\text{g}}^{-\text{3}}}\text{ }{{\text{s}}^{-\text{1}}}\] |
| D. | \[{{\text{m}}^{\text{2}}}\text{ k}{{\text{g}}^{-\text{3}}}\text{ }{{\text{s}}^{-\text{2}}}\] |
| Answer» B. \[{{m}^{3}}k{{g}^{-2}}{{s}^{-1}}\] | |
| 868. |
Which one of the following principles tells us that buoyant force acting on an object is equal to weight of the fluid displaced by that object? |
| A. | Kepler?s principle |
| B. | Archinedes? principle |
| C. | Newton's law |
| D. | Pascal's law |
| E. | None of these |
| Answer» C. Newton's law | |
| 869. |
The acceleration due to gravity on the surface of a planet whose mass is same as that of the earth and radius is half of that of the earth is: (mass of earth \[=\,6\times {{10}^{24}}kg,\] Radius of earth \[=\,6.4\,\times \,{{10}^{3}}\,km)\] |
| A. | \[35.08\,m/{{s}^{2}}\] |
| B. | \[39.08\,m/{{s}^{2}}\] |
| C. | \[28.08\,m/{{s}^{2}}\] |
| D. | \[9.08\,m/{{s}^{2}}\] |
| E. | None of these |
| Answer» C. \[28.08\,m/{{s}^{2}}\] | |
| 870. |
The ratio of SI units to CGS units of G is |
| A. | \[\text{1}{{0}^{\text{3}}}\] |
| B. | \[\text{1}{{0}^{\text{2}}}\] |
| C. | \[\text{1}{{0}^{-\text{2}}}\] |
| D. | \[\text{1}{{0}^{-\text{3}}}\] |
| Answer» B. \[\text{1}{{0}^{\text{2}}}\] | |
| 871. |
The value of G does not depend on |
| A. | nature of the interacting bodies |
| B. | size of the interacting bodies |
| C. | mass of the interacting bodies |
| D. | all of these |
| Answer» E. | |
| 872. |
What do we called the upward force acting on an object immersed in the liquid? |
| A. | Mechanical force |
| B. | Electrical force |
| C. | Buoyant force |
| D. | Gravitational force |
| E. | None of these |
| Answer» D. Gravitational force | |
| 873. |
The height at which the acceleration due to gravity becomes g/9 (where g is the acceleration due to gravity on the surface of the Earth) in terms of R, the radius of the Earth is |
| A. | 2R |
| B. | \[R/\sqrt{2}\] |
| C. | \[R/2\] |
| D. | \[\sqrt{2}/R\] |
| Answer» B. \[R/\sqrt{2}\] | |
| 874. |
A body is suspended from a spring balance kept in a satellite. The reading of the spring balance is \[{{W}_{1}}\] when the satellite goes in an orbit of radius R and \[{{W}_{2}}\] when it goes in an orbit of radius 2R. Which of the following is correct? |
| A. | \[{{W}_{1}}={{W}_{2}}\] |
| B. | \[{{W}_{1}}<{{W}_{2}}\] |
| C. | \[{{W}_{1}}>{{W}_{2}}\] |
| D. | \[{{W}_{1}}\ne {{W}_{2}}\] |
| Answer» B. \[{{W}_{1}}<{{W}_{2}}\] | |
| 875. |
A body is weighed at the poles and then at the equator The weight |
| A. | at the equator will be greater than at the poles |
| B. | at the poles will be greater than at the equator |
| C. | at the poles will be equal to the weight at the equator |
| D. | depends upon the object |
| Answer» C. at the poles will be equal to the weight at the equator | |
| 876. |
In whose honour the S.I unit of pressure is named? |
| A. | Isaac newton |
| B. | Blaise pascal |
| C. | Archimedes |
| D. | Kepler |
| E. | None of these |
| Answer» C. Archimedes | |
| 877. |
Two fixed point masses of 10 kg and 20 kg are located at (0 m, 0 m) and (5 m, 0 m). Where should a third point mass of 30 kg be kept so that the net force of attraction on 30 kg mass due to point masses 10 kg and 20 kg is zero? |
| A. | At 2.05 m from 10 kg mass |
| B. | At 2.05 m from 20 kg mass |
| C. | At 2.95 m from 10 kg mass |
| D. | At 3 m from 20 kg mass |
| Answer» B. At 2.05 m from 20 kg mass | |
| 878. |
A stone is dropped from a point at 3 : 30 : 32 p.m (hour : minute : second). Another stone is dropped from the same point at 3 : 30 : 34 p.m. Find the separation between the stones at 3 : 30 : 35 p.m. |
| A. | 50 m |
| B. | 39.2 m |
| C. | 100 m |
| D. | 48 m |
| E. | None of these |
| Answer» C. 100 m | |
| 879. |
An object floats in water such that \[\frac{1}{4}th\] of its volume is above the surface of water.When the same object is made to float in sample of impure alcohol, the volume that remains outside the liquid is \[\frac{1}{10}\] of total volume. The relative density of the sample of alcohol will be |
| A. | 84 |
| B. | 8.4 |
| C. | 0.84 |
| D. | 0.084 |
| Answer» D. 0.084 | |
| 880. |
1 kg wt is equal to |
| A. | 9.8 N |
| B. | 980 N |
| C. | 98 N |
| D. | none of these |
| Answer» B. 980 N | |
| 881. |
Find the weight of a person whose mass is 72 kg. |
| A. | 705.6 N |
| B. | 700 N |
| C. | 800 N |
| D. | 70 N |
| E. | None of these |
| Answer» B. 700 N | |
| 882. |
A tank 2 m high is half filled with water and then filled to the top with oil of density 0.60 g/cc. What is the pressure at the bottom of the tank due to these liquids? \[(Take\text{ }g\text{ }=\text{ }10\text{ }m\text{ }{{s}^{-2}})\] |
| A. | \[0.8\times {{10}^{2}}\text{ }N\text{ }{{m}^{-2}}\] |
| B. | \[0.8\times {{10}^{4}}\text{ }N\text{ }{{m}^{-2}}\] |
| C. | \[1.6\times {{10}^{2}}\text{ }N\text{ }{{m}^{-2}}\] |
| D. | \[1.6\times {{10}^{4}}\text{ }N\text{ }{{m}^{-2}}\] |
| Answer» E. | |
| 883. |
The force of gravitation exists |
| A. | every where in the universe |
| B. | at the surface of the earth only |
| C. | inside the earth only |
| D. | at the surface of the moon only |
| Answer» B. at the surface of the earth only | |
| 884. |
The force with which the earth attracts an object is called ____ of the object. |
| A. | Mass |
| B. | Weight |
| C. | Acceleration |
| D. | Distance |
| E. | None of these |
| Answer» C. Acceleration | |
| 885. |
Suppose, the acceleration due to gravity at the Earth's surface is \[10\text{ }m\text{ }{{s}^{-2}}\] and at the surface of Mars is \[4\text{ }m\text{ }{{s}^{-2}}\]. A 60 kg passenger goes from the Earth to the Mars in a spaceship moving with a constant velocity. Neglect all other objects in the sky. Which part of figure best represents the weight (net gravitational force) of the passenger as a function of time? |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» D. S | |
| 886. |
When an object is thrown up, the force of gravity |
| A. | acts in the direction of the motion |
| B. | acts in the opposite direction of the motion |
| C. | remains constant as the body moves up |
| D. | increases as the body moves up |
| Answer» C. remains constant as the body moves up | |
| 887. |
The force of gravitation between two bodies depend upon |
| A. | their separation |
| B. | gravitational constant |
| C. | product of their masses |
| D. | all of these |
| Answer» E. | |
| 888. |
A coil of wire of cross-section \[0.50\text{ }m{{m}^{2}}\] weighs 75g in air and 65g in water. The length of the coil in cm is |
| A. | \[\frac{{{10}^{2}}}{50}\] |
| B. | \[\frac{{{10}^{2}}}{0.50}\] |
| C. | \[\frac{{{10}^{5}}}{50}\] |
| D. | \[\frac{{{10}^{5}}}{0.0050}\] |
| Answer» D. \[\frac{{{10}^{5}}}{0.0050}\] | |
| 889. |
The value of g near the earth's surface is |
| A. | \[\text{8}.\text{9 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{8}.\text{9 m}/\text{s}\] |
| C. | \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{9}.\text{8 m}/\text{s}\] |
| Answer» D. \[\text{9}.\text{8 m}/\text{s}\] | |
| 890. |
A particle is released from rest from a height. Find the distance it falls through in 5 second. |
| A. | 102.5 m |
| B. | 122.5 m |
| C. | 108.5 m |
| D. | 109.5 m |
| E. | None of these |
| Answer» C. 108.5 m | |
| 891. |
Weight |
| A. | is a vector quantity |
| B. | of a body in interplanetary space is maximum |
| C. | increases when the bodies go up |
| D. | none of these |
| Answer» B. of a body in interplanetary space is maximum | |
| 892. |
The gravitational force between a man weighing 68 kg and a woman weighing 52 kg standing 4 metres apart. |
| A. | \[1.2\,\times \,{{10}^{-11}}N\] |
| B. | \[1.48\,\times \,{{10}^{-9}}N\] |
| C. | \[1.48\,\times \,{{10}^{-8}}N\] |
| D. | \[150\,\times \,{{10}^{-11}}N\] |
| E. | None of these |
| Answer» D. \[150\,\times \,{{10}^{-11}}N\] | |
| 893. |
Read the given statements and select the correct option. Statement 1: A pendulum can vibrate in an artificial satellite. Statement 2: Inside the satellite, acceleration due to gravity is zero. |
| A. | Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. |
| B. | Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. |
| C. | Statement 1 is true but statement 2 is false. |
| D. | Statement 1 is false but statement 2 is true. |
| Answer» E. | |
| 894. |
The value of universal Gravitational constant was first determined by: |
| A. | Gregor Mendel |
| B. | Ernst Haeckel |
| C. | Henry Cavendish |
| D. | Isaac newton |
| E. | None of these |
| Answer» D. Isaac newton | |
| 895. |
Which one of the following formula is correct for pressure? |
| A. | \[p\frac{F}{A}\] |
| B. | \[P=FA\] |
| C. | \[P=F+A~~~~~~~~\] |
| D. | \[P=F-A\] |
| E. | None of these |
| Answer» B. \[P=FA\] | |
| 896. |
In vacuum, all freely falling objects have: |
| A. | Same acceleration |
| B. | Same speed |
| C. | Same momentum |
| D. | same force |
| E. | None of these |
| Answer» B. Same speed | |
| 897. |
Riya buys a bag of sugar of weight W at a place on the equator. She takes it to Antarctica. The weight of a sugar bag at Antarctica |
| A. | Increases |
| B. | Decreases |
| C. | Remains same as the weight at a place on equator |
| D. | Cannot be said. |
| Answer» B. Decreases | |
| 898. |
A body falls freely towards the earth with |
| A. | uniform speed |
| B. | uniform velocity |
| C. | uniform acceleration |
| D. | none of these |
| Answer» D. none of these | |
| 899. |
Who discovered gravitational force? |
| A. | Sir Isacc Newton |
| B. | Robert Hook |
| C. | Robert Brown |
| D. | James Chadwick |
| E. | None of these |
| Answer» B. Robert Hook | |
| 900. |
Calculate the force of gravitation due to earth on a man weighing 100 kg standing on the ground? (mass of earth \[=\,6\times {{10}^{24}}kg,\] Radius of earth\[=\,6.4\times {{10}^{3}}km\]) |
| A. | 977 N |
| B. | 1000 N |
| C. | 1230 N |
| D. | 1524 N |
| E. | None of these |
| Answer» B. 1000 N | |