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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.
| 801. |
Choose the correct statement of the following: |
| A. | All bodies repel each other in this universe. |
| B. | Our earth does not behave like a magnet. |
| C. | Acceleration due to gravity is\[\text{8}.\text{9 m}/{{\text{s}}^{\text{2}}}\]. |
| D. | All bodies fall at the same rate in vacuum. |
| Answer» E. | |
| 802. |
If the earth shrinks to half of its radius, its mass remaining same, the weight of an object on earth will change ...... times ? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 803. |
If the change in the value of g at a height h above the surface of the earth is the same as at a depth \[X\] below it when both \[X\] and h are much smaller than the radius of the earth, then |
| A. | \[x=h\] |
| B. | \[x=2h\] |
| C. | \[x=\frac{h}{2}\] |
| D. | \[x=\frac{h}{3}\] |
| Answer» C. \[x=\frac{h}{2}\] | |
| 804. |
The acceleration due to gravity is |
| A. | It is more at the equator than at the poles |
| B. | It is not effected by the rotation of the earth |
| C. | It is effected by the rotation of the earth |
| D. | It is not effected by the latitude |
| Answer» D. It is not effected by the latitude | |
| 805. |
For moon, its mass is \[\frac{1}{81}\] of earth's mass and its diameter is \[\frac{1}{3.7}\]of earth's diameter. If acceleration due to gravity of earth surface is\[\text{9}\text{.8 m}/{{\text{s}}^{\text{2}}}\], then at moon its value is |
| A. | \[\text{2}.\text{86 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{1}.\text{65 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{8}.\text{65 mi}{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{5}.\text{16 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» C. \[\text{8}.\text{65 mi}{{\text{s}}^{\text{2}}}\] | |
| 806. |
A satellite is going around the earth. Which of the following statement is not correct? |
| A. | It is freely falling body |
| B. | It experiences no acceleration |
| C. | It is moving with constant speed |
| D. | Its angular momentum is constant |
| Answer» C. It is moving with constant speed | |
| 807. |
If the speed of rotation of earth about its axis increases, then the weight of the body at the equator will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | sometimes decrease and sometimes increase |
| Answer» C. remain unchanged | |
| 808. |
Where is the intensity of the gravitational field of the earth maximum? |
| A. | Centre of earth |
| B. | Equator |
| C. | Poles |
| D. | Same everywhere |
| Answer» D. Same everywhere | |
| 809. |
Weightlessness produced in a spaceship is due to |
| A. | absence of inertia |
| B. | absence of gravity due to earth |
| C. | absence of accelerating force |
| D. | free fall of the spaceship |
| Answer» E. | |
| 810. |
What is the value of universal gravitational constant? |
| A. | \[5.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] |
| B. | \[6.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] |
| C. | \[4.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] |
| D. | \[3.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] |
| E. | None of these |
| Answer» C. \[4.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] | |
| 811. |
Match the column I with column II and select the correct option from the codes given below. Column I Column II (a) \[g\] at height \[h\] (i) \[g\left( 1-\frac{2h}{R} \right)\] (b) \[g\] at depth \[h\] (ii) \[\frac{GM}{{{R}^{2}}}\] (c) \[{{g}_{poles}}\] (iii) \[g\left( 1-\frac{h}{R} \right)\] (d) \[g\] (iv) Maximum |
| A. | (a) - (i), (b) - (ii), (c) - (iii), (d) - (iv) |
| B. | (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) |
| C. | (a) - (i), (b) - (iii), (c) - (iv), (d) - (ii) |
| D. | (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii) |
| Answer» D. (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii) | |
| 812. |
\[SI\]unit of G is |
| A. | \[{{N}^{2}}-{{m}^{2}}/kg\] |
| B. | \[N-{{m}^{2}}/kg\] |
| C. | \[N-m/kg\] |
| D. | \[N-{{m}^{2}}/k{{g}^{2}}\] |
| Answer» E. | |
| 813. |
If the gravitational force of earth suddenly disappears, then which of the following is correct? |
| A. | Weight of the body is zero |
| B. | Mass of the body is zero |
| C. | Both mass and weight becomes zero |
| D. | Neither the weight nor the mass is zero. |
| Answer» B. Mass of the body is zero | |
| 814. |
A body of mass m falls from a height R above the surface of the earth, where R is the radius of the earth. What is the velocity attained by the body on reaching the ground? Acceleration due to gravity on the surface of the earth is g? |
| A. | \[gR\] |
| B. | \[\sqrt{gR}\] |
| C. | \[\sqrt{\frac{g}{R}}\] |
| D. | \[\frac{g}{R}\] |
| Answer» C. \[\sqrt{\frac{g}{R}}\] | |
| 815. |
If density of the earth is doubled keeping its radius constant, then acceleration due to gravity (\[\text{present value 9}.\text{8m}{{\text{s}}^{-\text{2}}}\]) will be |
| A. | \[~\text{2}.\text{45m}{{\text{s}}^{-\text{2}}}\] |
| B. | \[\text{4}.\text{9m}{{\text{s}}^{-\text{2}}}\] |
| C. | \[\text{9}.\text{8m}{{\text{s}}^{-\text{2}}}\] |
| D. | \[\text{19}.\text{6m}{{\text{s}}^{-\text{2}}}\] |
| Answer» D. \[\text{19}.\text{6m}{{\text{s}}^{-\text{2}}}\] | |
| 816. |
Mass of the earth is 81 times the mass of the moon and distance between the earth and moon is 60 times the radius of the earth. If R is radius of the earth, then distance between the moon and the point on the line joining the moon and earth where the gravitational force becomes zero is |
| A. | 30R |
| B. | 15R |
| C. | 6R |
| D. | 5R |
| Answer» D. 5R | |
| 817. |
If gravitational mass of a body on the moon be denoted by \[{{M}_{m}}\] and that on the earth be \[{{M}_{e}}\], then |
| A. | \[{{M}_{m}}=\frac{1}{6}\] |
| B. | \[{{M}_{m}}={{M}_{e}}\] |
| C. | \[{{M}_{m}}=\sqrt{{{M}_{e}}}\] |
| D. | \[{{M}_{m}}=6{{M}_{e}}\] |
| Answer» C. \[{{M}_{m}}=\sqrt{{{M}_{e}}}\] | |
| 818. |
The gravitational intensity is denoted by |
| A. | \[g\] |
| B. | G |
| C. | \[E\] |
| D. | none of these |
| Answer» B. G | |
| 819. |
The angular velocity of rotation of the earth in order to make the effective acceleration due to gravity equal to zero at equator should be |
| A. | \[\text{2}.\text{15 }\times \text{ 1}{{0}^{\text{3}}}\text{ rad}/\text{sec}\] |
| B. | \[\text{2}.\text{25 }\times \text{ 1}{{0}^{-\text{3}}}\text{ rad}/\text{sec}\] |
| C. | \[\text{1}.\text{25 }\times \text{ 1}{{0}^{\text{3}}}\text{ rad}/\text{sec}\] |
| D. | \[\text{1}.\text{25 }\times \text{ 1}{{0}^{-\text{3}}}\text{ rad}/\text{sec}\] |
| Answer» E. | |
| 820. |
A satellite is revolving in a circular orbit at a distance of 2620 km from the surface of the earth. The time period of revolution of the satellite is (Radius of the earth = 6380 km, mass of the earth \[=6\times {{10}^{24}}kg,G=6.67\times {{10}^{-11}}N-{{m}^{2}}^{/}k{{g}^{2}})\] |
| A. | 2.35 hours |
| B. | 23.5 hours |
| C. | 3.25 hours |
| D. | 32.5 hours |
| Answer» B. 23.5 hours | |
| 821. |
What is the value of acceleration due to gravity on the earth? |
| A. | \[9.8\,m/{{s}^{2}}\] |
| B. | \[6.8\,m/{{s}^{2}}\] |
| C. | \[5.8\,m/{{s}^{2}}\] |
| D. | \[4.9\,m/{{s}^{2}}\] |
| E. | None of these |
| Answer» B. \[6.8\,m/{{s}^{2}}\] | |
| 822. |
Read the given statements and mark the correct option.Statement 1: The value of acceleration due to gravity of Earth does not depend upon mass of the body.Statement 2: Acceleration due to gravity is a constant quantity. |
| 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. | Both statements 1 and 2 are false. |
| Answer» D. Both statements 1 and 2 are false. | |
| 823. |
\[SI\] unit of g is- |
| A. | \[{{m}^{2}}/s\] |
| B. | \[\text{m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{s}/{{\text{m}}^{\text{2}}}\] |
| D. | \[\text{m}/\text{s}\] |
| Answer» C. \[\text{s}/{{\text{m}}^{\text{2}}}\] | |
| 824. |
On a planet (whose size is the same and mass 4 times as that of the earth), the energy needed to lift a 2 kg mass vertically upwards through 2 m distance on the planet is \[(\text{g }=\text{ 1}0\text{ m}/{{\text{s}}^{\text{2}}}\]on the surface of the earth) |
| A. | 16 joules |
| B. | 160 joules |
| C. | 32 joules |
| D. | 320 joules |
| Answer» C. 32 joules | |
| 825. |
A planet of mass m moves around the sun of mass M in an elliptical orbit. The maximum and minimum distances of the planet from the sun are \[{{r}_{1}}\] and \[{{r}_{2}}\]. respectively. The time period of the planet is proportional to |
| A. | \[{{r}_{1}}^{\frac{3}{2}}\] |
| B. | \[{{r}_{2}}^{\frac{3}{2}}\] |
| C. | \[\frac{{{({{r}_{1}}+{{r}_{2}})}^{\frac{3}{2}}}}{2}\] |
| D. | \[\frac{{{({{r}_{1}}-{{r}_{2}})}^{\frac{3}{2}}}}{2}\] |
| Answer» D. \[\frac{{{({{r}_{1}}-{{r}_{2}})}^{\frac{3}{2}}}}{2}\] | |
| 826. |
What will be the acceleration due to gravity on the surface of moon if its radius is \[\frac{1}{4}\]th the radius of the earth and its mass is \[\frac{1}{80}\] th the mass of earth? |
| A. | \[\frac{g}{2}\] |
| B. | \[\frac{g}{3}\] |
| C. | \[\frac{g}{7}\] |
| D. | \[\frac{g}{5}\] |
| Answer» E. | |
| 827. |
A spaceship is launched into a circular orbit close to earth's surface. What additional velocity ha now to be imparted to the spaceship in the orbit to overcome the gravitational pull? (Radius of earth = 6400 km and\[\text{g }=\text{ 9}\text{.8 m}/{{\text{s}}^{\text{2}}}\]) |
| A. | 2.83 km/s |
| B. | 3.28 km/sec |
| C. | 6.68 km/s |
| D. | 8.32 km/sec |
| Answer» C. 6.68 km/s | |
| 828. |
A particle of mass m revolves round a horizontal circle of radius r under the influence of a K centripetal force equal to \[-\frac{k}{2r}\] , where K stands for a constant. What is the total energy possesses by this particle? |
| A. | \[+\frac{k}{r}\] |
| B. | \[-\frac{k}{2r}\] |
| C. | \[-\frac{\text{ 2K}}{r}\] |
| D. | \[+\frac{\text{ K}}{{{r}^{2}}}\] |
| Answer» C. \[-\frac{\text{ 2K}}{r}\] | |
| 829. |
An artificial satellite of mass 200 kg revolves around the earth in an orbit of average radius 667 km. Its total energy in the orbit is (Mass of the earth = \[6.0\times {{10}^{24}}kg\] and\[~\text{G }=\text{ 6}.\text{67 }\times \text{1}{{0}^{-\text{11}}}\text{ N}-{{m}^{2}}\text{/k}{{\text{g}}^{\text{2}}})\] |
| A. | \[\text{6}.\text{6 }\times \text{ 1}{{0}^{9}}\text{ joule}\] |
| B. | \[-\text{ 6}.\text{6 }\times \text{ 1}{{0}^{\text{9}}}\text{ joule}\] |
| C. | \[\text{6}.\text{6 }\times \text{ 1}{{0}^{-\text{9}}}\text{ joule}\] |
| D. | \[-\text{ 6}.\text{6 }\times \text{ 1}{{0}^{-\text{9}}}\text{ joule}\] |
| Answer» C. \[\text{6}.\text{6 }\times \text{ 1}{{0}^{-\text{9}}}\text{ joule}\] | |
| 830. |
The apparent weight of a body weighing M kg Wt during free fall is |
| A. | less than M kg wt |
| B. | more than M kg wt |
| C. | equal to M kg wt |
| D. | zero |
| Answer» E. | |
| 831. |
If R is the radius of the earth and g the acceleration due to gravity on the earth's surface, then mean density of the earth is |
| A. | \[\frac{4\pi G}{3gR}\] |
| B. | \[\frac{3\pi R}{4gG}\] |
| C. | \[\frac{3g}{4\pi RG}\] |
| D. | \[\frac{\pi g}{12RG}\] |
| Answer» D. \[\frac{\pi g}{12RG}\] | |
| 832. |
There are four objects of equal mass at a distance of 4m, 8m 6m and 10m from a pole. Which object will have maximum force of attraction with the pole? |
| A. | The object which is 4 m away from the pole |
| B. | The object which is 8 m away from the pole |
| C. | The object which is 6 m away from the pole |
| D. | The object which is 10 m away from the pole |
| E. | None of these |
| Answer» B. The object which is 8 m away from the pole | |
| 833. |
At what height, is the value of g half that on the surface of earth? (R = radius of the earth) |
| A. | \[0.\text{414R}\] |
| B. | R |
| C. | 2R |
| D. | 3.5R |
| Answer» B. R | |
| 834. |
Two rubber balls of the same size are dropped on the Earth and on the Moon. One ball is solid, and one is hollow. The approximate gravitational field strength on the Earth is 10 N/kg and on the Moon is 1.7 N/kg. Which ball has the greatest force acting on it? |
| A. | Type of ball Where dropped Hollow On the Earth |
| B. | Type of ball Where dropped Hollow On the Moon |
| C. | Type of ball Where dropped Solid On the Earth |
| D. | Type of ball Where dropped Solid On the Moon |
| Answer» D. Type of ball Where dropped Solid On the Moon | |
| 835. |
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | may be positive or negative depending upon its initial velocity |
| Answer» C. zero | |
| 836. |
The atmosphere is held to the earth by. |
| A. | Magnetic field of earth |
| B. | Clouds |
| C. | Wind |
| D. | Gravity |
| E. | None of these |
| Answer» E. None of these | |
| 837. |
There are two bodies of masses 100 kg and 10000 kg separated by a distance 1m. At what distance from the smaller body, intensity of gravitational field will be zero? |
| A. | \[\frac{1}{9}m\] |
| B. | \[\frac{1}{10}m\] |
| C. | \[\frac{1}{11}m\] |
| D. | \[\frac{10}{11}m\] |
| Answer» D. \[\frac{10}{11}m\] | |
| 838. |
Find the mass of an object whose weight on earth is 98 N. |
| A. | 98 kg |
| B. | 10 kg |
| C. | 120 kg |
| D. | 110 kg |
| E. | None of these |
| Answer» C. 120 kg | |
| 839. |
The force per unit area is called: |
| A. | Pascal |
| B. | Pressure |
| C. | Buoyant force |
| D. | Weight |
| E. | None of these |
| Answer» C. Buoyant force | |
| 840. |
The gravitational pull exerted by the earth on a body is called its |
| A. | true weight |
| B. | mass |
| C. | gravitational mass |
| D. | inertial mass |
| Answer» B. mass | |
| 841. |
The weight of an object of mass 10 kg at the centre of the earth is ____. |
| A. | 98 kg |
| B. | Zero |
| C. | 140 N |
| D. | 98 N |
| E. | None of these |
| Answer» C. 140 N | |
| 842. |
The escape velocity from the earth's surface is 11 km/sec. A certain planet has a radius twice that of the earth but its mean density is the same as that of the earth. The value of the escape velocity from this planet would be |
| A. | 11 km/sec |
| B. | 22 km/sec |
| C. | 33 km/sec |
| D. | 16.5 km/sec |
| Answer» C. 33 km/sec | |
| 843. |
Two protons kept at a separation of 1 fem to meter\[(1fm\,\,={{10}^{-15}}m)\]. The gravitational force between two protons is: (mass of proton\[=1.7\times {{10}^{-27}}kg\]) |
| A. | \[1.6\times {{10}^{-36}}\,N\] |
| B. | \[1.86\times {{10}^{-34}}N\] |
| C. | \[1.19\times {{10}^{-35}}N\] |
| D. | \[1.62\times {{10}^{-35}}N\] |
| E. | None of these |
| Answer» C. \[1.19\times {{10}^{-35}}N\] | |
| 844. |
Two metal spheres of equal radius r are touching each other. The force of attraction F between them is |
| A. | \[F\propto {{r}^{4}}\] |
| B. | \[F\propto {{r}^{6}}\] |
| C. | \[F\propto {{r}^{2}}\] |
| D. | \[F\propto \frac{1}{{{r}^{2}}}\] |
| Answer» B. \[F\propto {{r}^{6}}\] | |
| 845. |
The weight of an object |
| A. | is the quantity of the matter it contains |
| B. | refers to its inertia |
| C. | is the same as its mass but is expressed in different unit |
| D. | is the force with which it is attracted towards the earth |
| Answer» E. | |
| 846. |
The final velocity of a body moving against gravity when it attains the maximum height is: |
| A. | h/t |
| B. | h |
| C. | 2 gh |
| D. | Zero |
| E. | None of these |
| Answer» E. None of these | |
| 847. |
If a satellite is orbiting close to the surface of the earth, then its speed is |
| A. | \[\sqrt{2}Rg\] |
| B. | \[Rg\] |
| C. | \[\sqrt{\frac{Rg}{2}}\] |
| D. | \[\sqrt{Rg}\] |
| Answer» E. | |
| 848. |
A satellite which is geostationary in a particular orbit is taken to another orbit. Its distance from the centre of earth in new orbit is 2 times than that of the earlier orbit. The time period in the second orbit is |
| A. | 4.8 hours |
| B. | \[48\sqrt{2}\] hours |
| C. | 24 hours |
| D. | \[24\sqrt{2}\] hours |
| Answer» C. 24 hours | |
| 849. |
As we go below the surface of the earth, the acceleration due to gravity ____. |
| A. | Goes on decreasing |
| B. | Goes on increasing |
| C. | Remains constant |
| D. | Either [a] or [b] |
| E. | None of these |
| Answer» B. Goes on increasing | |
| 850. |
Weight is |
| A. | measured by a spring balance |
| B. | measured by a beam balance |
| C. | measured in kg |
| D. | a scalar quantity |
| Answer» B. measured by a beam balance | |