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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.
| 951. |
As we go to the higher altitudes the gravitational attraction of the earth |
| A. | increases |
| B. | Decreases |
| C. | Does not change |
| D. | First increase then decrease |
| Answer» C. Does not change | |
| 952. |
Two planets have radii r and 2r and densities are d and 4d respectively. The ratio of their acceleration due to gravities is |
| A. | 1 : 8 |
| B. | 8 : 1 |
| C. | 4 : 1 |
| D. | 1 : 4 |
| Answer» B. 8 : 1 | |
| 953. |
Masses of the earth and the moon are in the ratio of 3 : 2 and the radii of the earth and the moon are in the ratio of 6 : 1. The ratio of the weight of the body on their surfaces will be |
| A. | \[\frac{1}{12}\] |
| B. | \[\frac{1}{24}\] |
| C. | \[\frac{12}{1}\] |
| D. | \[\frac{24}{1}\] |
| Answer» C. \[\frac{12}{1}\] | |
| 954. |
When a space ship is at a distance equal to two earth's radius from the centre of the earth, the gravitational acceleration is |
| A. | \[\text{19}.\text{6 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{4}.\text{9 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{2}.\text{45 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» E. | |
| 955. |
A sphere of mass 40 kg is attracted by a second sphere of mass 60 kg with a force equal to\[4\times {{10}^{-5}}N\].If\[G=6\times {{10}^{-11}}N{{m}^{2}}/k{{g}^{2}},\] calculate the distance between the two spheres. |
| A. | 3 cm. |
| B. | 6 cm. |
| C. | 9 cm. |
| D. | 10 cm. |
| Answer» C. 9 cm. | |
| 956. |
Ratio of g value at a depth \[{}^{R}/{}_{5}\]. to a depth \[{}^{R}/{}_{10}\] from the surface of the earth is |
| A. | \[\frac{5}{10}\] |
| B. | \[\frac{2}{1}\] |
| C. | \[\frac{8}{9}\] |
| D. | \[\frac{9}{8}\] |
| Answer» D. \[\frac{9}{8}\] | |
| 957. |
If the change in the value of g at a height above the surface of the earth is the same as at a depth\[x\]below it, and 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. | \[x=\frac{3h}{2}\] |
| Answer» C. \[x=\frac{h}{2}\] | |
| 958. |
The value of g is. with depth |
| A. | Increases |
| B. | Decreases |
| C. | Does not change |
| D. | increases or decreases |
| Answer» C. Does not change | |
| 959. |
The gravitational force of attraction between two spherical bodies, each of mass 1kg placed at 10m apart is: |
| A. | \[\text{6}.\text{67}\times \text{1}{{0}^{-\text{13}}}\text{ N}\] |
| B. | \[\text{6}.\text{67}\times \text{1}{{0}^{-11}}\text{ N}\] |
| C. | \[\text{6}.\text{67}\times \text{1}{{0}^{-\text{7}}}\text{ N}\] |
| D. | \[\text{6}.\text{67}\times \text{1}{{0}^{-4}}\text{ N}\] |
| Answer» B. \[\text{6}.\text{67}\times \text{1}{{0}^{-11}}\text{ N}\] | |
| 960. |
Which of the following statements is NOT correct about a planet rotating around the sun in an elliptical orbit? |
| A. | Its kinetic energy is constant. |
| B. | Its angular momentum is constant. |
| C. | Its areal velocity is constant. |
| D. | Its time period is proportional to r3. |
| Answer» B. Its angular momentum is constant. | |
| 961. |
Two planets \[A\] and B have their radii in the ratio of \[2:5\] and densities in the ratio of \[1:6\] respectively. Which of the following statements is NOT true regarding the given information? |
| A. | The ratio of acceleration due to gravity on them is\[1:15\]. |
| B. | For the same volume of planets, mass of planet \[A\] is greater than that of planet\[B\]. |
| C. | A body weighs \[15\] times more on planet \[B\] than on planet\[A\]. |
| D. | Planet \[B\] has greater volume than planet\[A\]. |
| Answer» C. A body weighs \[15\] times more on planet \[B\] than on planet\[A\]. | |
| 962. |
The distances of two planets (Neptune and Saturn) from the sun are \[1013\,\,m\] and \[1012\,\,m\] respectively. Find the ratio of the time periods of the planets. |
| A. | \[100:1\] |
| B. | \[1:\sqrt{10}\] |
| C. | \[\sqrt{10}:1\] |
| D. | \[10\sqrt{10}:1\] |
| Answer» E. | |
| 963. |
Find the gravitational attraction between the two atoms in a hydrogen molecule when \[G\] is\[6.67\times {{10}^{-11}}N{{m}^{2}}k{{g}^{-2}}\], mass of a hydrogen atom is \[1.67\times {{10}^{-27}}kg\] and distance between the two atoms is \[1\,\overset{o}{\mathop{A}}\,\]. |
| A. | \[11.14\times {{10}^{-18}}N\] |
| B. | \[2.39\times {{10}^{-45}}N\] |
| C. | \[1.86\times {{10}^{-44}}N\] |
| D. | \[4.18\times {{10}^{-23}}N\] |
| Answer» D. \[4.18\times {{10}^{-23}}N\] | |
| 964. |
Two bodies of masses \[20\,\,kg\] and \[15\,\,kg\] are dropped from the top of a building. At any instant during the fall, which of the following energies will both the bodies possess in equal measure? |
| A. | Potential energy |
| B. | Kinetic energy |
| C. | Momentum |
| D. | Acceleration |
| Answer» E. | |
| 965. |
A block of wood of length \[40\,\,cm\] and area of cross section \[15\,\,c{{m}^{2}}\] floats in water with \[3/8\] of its length above water. What is the density of wood? (density of wafer \[=1\,\,g\,\,c{{m}^{-3}}\]) |
| A. | \[0.256\,\,g\,\,c{{m}^{-3}}\] |
| B. | \[0.526\,\,g\,\,c{{m}^{-3}}\] |
| C. | \[0.625\,\,g\,\,c{{m}^{-3}}\] |
| D. | \[0.650\,\,g\,\,c{{m}^{-3}}\] |
| Answer» D. \[0.650\,\,g\,\,c{{m}^{-3}}\] | |
| 966. |
A stone is dropped from a building and \[2\] seconds later another stone is dropped. How far apart are these two stones by the time the first one reaches a speed of\[30\,\,m\,\,{{s}^{-1}}\](Take\[g=10\,\,m\,\,{{s}^{-2}}\]) |
| A. | \[80\,\,m\] |
| B. | \[100\,\,m\] |
| C. | \[60\,\,m\] |
| D. | \[40\,\,m\] |
| Answer» E. | |
| 967. |
If \[F\]is the force between two bodies of masses \[{{m}_{1}}\] and \[{{m}_{2}}\] at certain separation, then what is the force between \[\sqrt{5}{{m}_{1}}\]and \[\sqrt{3}{{m}_{2}}\] at the same separation? |
| A. | \[\sqrt{5}F\] |
| B. | \[F/\sqrt{15}\] |
| C. | \[\sqrt{15}F\] |
| D. | \[F\] |
| Answer» D. \[F\] | |
| 968. |
A body weighs \[12\,\,N\] on the surface of the moon. What is its weight on the surface of the earth? |
| A. | \[72\,\,N\] |
| B. | \[2\,\,N\] |
| C. | \[24\,\,N\] |
| D. | \[Zero\] |
| Answer» B. \[2\,\,N\] | |
| 969. |
A wooden cylinder floats vertically in water with one fourth of its length immersed. What will be the density of wood? |
| A. | It equals to the density of water. |
| B. | It equals to half the density of water. |
| C. | It equals to one fourth the density of water. |
| D. | It equals to three fourths the density of water. |
| Answer» D. It equals to three fourths the density of water. | |
| 970. |
If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, what will happen? |
| A. | The satellite will continue to move in its orbit with the same velocity. |
| B. | The satellite will move tangentially and escape away from its orbit. |
| C. | The satellite will become stationary in its orbit. |
| D. | The satellite will move towards the earth. |
| Answer» C. The satellite will become stationary in its orbit. | |
| 971. |
Compare the pressure exerted by a sharp needle on a surface and the pressure exerted by a blunt needle. |
| A. | The pressure exerted by a sharp needle is more. |
| B. | The pressure exerted by a blunt needle is less. |
| C. | The pressure exerted by both is equal. |
| D. | It cannot be determined. |
| Answer» B. The pressure exerted by a blunt needle is less. | |
| 972. |
A stone is thrown vertically upwards with an initial velocity of\[14\,\,m\,\,{{s}^{-1}}\]. Find the time taken by the stone to strike the ground. (Take\[g=9.8\,\,m\,\,{{s}^{-2}}\]) |
| A. | \[2.86\,\,s\] |
| B. | \[3.46\,\,s\] |
| C. | \[3.86\,\,s\] |
| D. | \[4.86\,\,s\] |
| Answer» B. \[3.46\,\,s\] | |
| 973. |
A rectangular iron block is placed over a table in different ways such that different faces touch the table. In all these cases, which of the following can be concluded? |
| A. | The block exerts the same thrust and same pressures. |
| B. | The block exerts the same thrust and different pressure. |
| C. | The block exerts different thrusts but the same pressures. |
| D. | The block exerts different thrusts and different pressures. |
| Answer» C. The block exerts different thrusts but the same pressures. | |
| 974. |
If a body floats with \[{{\left( \frac{p}{q} \right)}^{th}}\] of its volume above the surface of water, find the relative density of the body. |
| A. | \[\frac{q+p}{q}\] |
| B. | \[1-\frac{p}{q}\] |
| C. | \[\frac{1-p}{q}\] |
| D. | \[\frac{p}{q}\] |
| Answer» C. \[\frac{1-p}{q}\] | |
| 975. |
Two stretched membranes of area \[2\,\,c{{m}^{2}}\] and \[3\,\,c{{m}^{2}}\] are placed in a liquid at the same depth. Find the ratio of the pressure on them. |
| A. | \[1:1\] |
| B. | \[2:3\] |
| C. | \[3:2\] |
| D. | \[{{2}^{2}}:{{3}^{2}}\] |
| Answer» B. \[2:3\] | |
| 976. |
Equal masses of water and a liquid of relative density \[2\] are mixed together/then what is the density of the mixture (in\[g\,\,c{{m}^{-3}}\])? |
| A. | \[2/3\] |
| B. | \[4/3\] |
| C. | \[3/2\] |
| D. | \[3\] |
| Answer» C. \[3/2\] | |
| 977. |
A body of density \[\rho \] and volume \[V\] is floating in a liquid of density\[\sigma \], then which of the following statements about the body is correct? |
| A. | Its true weight is\[V\sigma g\]. |
| B. | Loss in its weight is\[V\sigma g\]. |
| C. | Its apparent weight is zero. |
| D. | Its density \[\rho \] is greater than that of liquid\[\sigma \]. |
| Answer» D. Its density \[\rho \] is greater than that of liquid\[\sigma \]. | |
| 978. |
A rectangular tank of \[6\,\,m\] long, \[2\,\,m\] broad and \[2\,\,m\] deep is full of water, what is the thrust acting on the bottom of the tank? |
| A. | \[23.52\times {{10}^{4}}N\] |
| B. | \[23.52N\] |
| C. | \[11.76\times {{10}^{4}}N\] |
| D. | \[3.92\times {{10}^{4}}N\] |
| Answer» B. \[23.52N\] | |
| 979. |
The figure given below shows a planet in elliptical orbit around the sun\[S\]. At what position will the kinetic energy of the planet be maximum? |
| A. | \[{{P}_{1}}\] |
| B. | \[{{P}_{4}}\] |
| C. | \[{{P}_{3}}\] |
| D. | \[{{P}_{2}}\] |
| Answer» B. \[{{P}_{4}}\] | |
| 980. |
A hollow metal sphere of mass \[180.6\,\,g\] contains a cavity of volume\[2.5\,\,c{{m}^{3}}\]. This metal when placed in water/displaces \[24\,\,cc\] of water. Find the specific gravity of the metal. |
| A. | \[21.5\,\,g\,c{{m}^{-3}}\] |
| B. | \[6.3\,\,g\,\,c{{m}^{-3}}\] |
| C. | \[8.4\,\,g\,\,c{{m}^{-3}}\] |
| D. | \[24\,\,g\,\,c{{m}^{-3}}\] |
| Answer» D. \[24\,\,g\,\,c{{m}^{-3}}\] | |
| 981. |
A liquid exerts a pressure of \[100,999\,\,Pa\] on an object when it is \[73.5\,\,cm\] below the liquid surface. What is the density of the liquid? (Take\[g=10\,\,m{{s}^{-2}}\]) |
| A. | \[136\,\,kg\,\,{{m}^{-3}}\] |
| B. | \[272\,\,kg\,\,{{m}^{-3}}\] |
| C. | \[13,700\,\,kg\,\,{{m}^{-3}}\] |
| D. | \[27,200\,\,kg\,\,{{m}^{-3}}\] |
| Answer» D. \[27,200\,\,kg\,\,{{m}^{-3}}\] | |
| 982. |
A diver is \[20\,\,m\] below the water surface. Given that the density of the water is\[1000\,\,kg\,\,{{m}^{-3}}\], what is the pressure exerted by the water on the diver? (Take\[g=10\,\,m{{s}^{-2}}\]) |
| A. | \[10,000Pa\] |
| B. | \[1,00,000Pa\] |
| C. | \[2,00,000Pa\] |
| D. | \[3,00,000Pa\] |
| Answer» D. \[3,00,000Pa\] | |
| 983. |
To reach the same height on the moon as on the earth, a body must be projected up with |
| A. | higher velocity on the moon. |
| B. | lower velocity on the moon. |
| C. | same velocity on the moon as that of the earth. |
| D. | It depends on the mass of the body. |
| Answer» C. same velocity on the moon as that of the earth. | |
| 984. |
As we go from the equator towards the poles/the value of\[g\] |
| A. | remains the same. |
| B. | decreases. |
| C. | increases. |
| D. | decreases up to the altitude of \[{{45}^{o}}\] and then increases |
| Answer» D. decreases up to the altitude of \[{{45}^{o}}\] and then increases | |
| 985. |
A stone is dropped from a tower. It was found that it covered a distance of \[45\,\,m\] during its last second of the fall. Calculate the time of the fall and the height of the tower?\[(g=10\,\,m\,\,{{s}^{-2}})\] |
| A. | \[5s,\,\,45m\] |
| B. | \[10s,\,\,90m\] |
| C. | \[5s,\,\,125m\] |
| D. | \[10s,\,\,100m\] |
| Answer» D. \[10s,\,\,100m\] | |
| 986. |
A freely falling body covers half of its journey from the top of a tower in\[0.5\,\,s\]. What is the height of the tower? |
| A. | \[4.9\,\,m\] |
| B. | \[2.45\,\,m\] |
| C. | \[9.8\,\,m\] |
| D. | \[9\,\,m\] |
| Answer» C. \[9.8\,\,m\] | |
| 987. |
Two stones are thrown from the top of a building with the same speed\[u\], one in the upward direction and the other in the downward direction. When they reach the ground/they acquire certain velocities \[{{v}_{1}}\] and \[{{v}_{2}}\] respectively. What is the ratio of \[{{v}_{1}}\] and\[{{v}_{2}}\]? |
| A. | \[1:1\] |
| B. | \[1:2\] |
| C. | \[2:1\] |
| D. | \[2:3\] |
| Answer» B. \[1:2\] | |
| 988. |
If a freely falling body travels in the last second a distance equal to the distance travelled by it in the first \[3\] seconds. Find the time of its travel. |
| A. | \[3s\] |
| B. | \[4s\] |
| C. | \[5s\] |
| D. | \[6s\] |
| Answer» D. \[6s\] | |
| 989. |
Where will it be profitable to purchase one kilogram sugar? |
| A. | At the poles |
| B. | At the equator |
| C. | At \[{{45}^{o}}\]latitude |
| D. | At \[{{40}^{o}}\]latitude |
| Answer» B. At the equator | |
| 990. |
A body falling freely from rest covers \[\frac{7}{16}\] of the total height in the last second of its fall. What is the height from which it falls? |
| A. | \[24.2\,\,m\] |
| B. | \[38.4\,\,m\] |
| C. | \[78.4\,\,m\] |
| D. | \[46.8\,\,m\] |
| Answer» D. \[46.8\,\,m\] | |
| 991. |
A body is projected vertically upwards with a velocity of\[96\,\,ft\,\,{{s}^{-1}}\]. How long will the body remain in air?\[(g=32\,\,ft\,{{s}^{-2}})\] |
| A. | \[3s\] |
| B. | \[6s\] |
| C. | \[9s\] |
| D. | \[12s\] |
| Answer» C. \[9s\] | |
| 992. |
A wooden block of mass \[10\,\,g\] is dropped on the top of a cliff \[100\,\,m\] high. Simultaneously, a bullet of mass \[10\,\,g\] is fired from the foot of the cliff upward with a velocity of\[100\,\,m\,\,{{s}^{-1}}\]. At what time will the bullet and the wooden block meet?\[(g=32\,\,ft\,\,{{s}^{-2}})\] |
| A. | \[1s\] |
| B. | \[2s\] |
| C. | \[3s\] |
| D. | \[4s\] |
| Answer» B. \[2s\] | |
| 993. |
If it is safe to jump from a height of \[2\,\,m\] on to the earth, what would be the safe height on a planet where the value of \['g'\] is\[1.96\,\,m\,\,{{s}^{-2}}\]? |
| A. | \[2m\] |
| B. | \[4m\] |
| C. | \[6m\] |
| D. | \[10m\] |
| Answer» E. | |
| 994. |
From the top of a building of height\[40\,\,m\], a boy throws a stone vertically upwards with an initial velocity of \[10\,\,m\,\,{{s}^{-1}}\] such that it eventually falls to the ground. At what time will the stone reach the ground?\[(g=10\,\,m{{s}^{-2}})\] |
| A. | \[4s\] |
| B. | \[3s\] |
| C. | \[2s\] |
| D. | \[1s\] |
| Answer» B. \[3s\] | |
| 995. |
A stone is thrown upwards with a speed \['u'\] from the top of a tower. It reaches the ground with a velocity\['3u'\]. Find the height of the tower. |
| A. | \[\sqrt{3}\] |
| B. | \[\frac{2{{u}^{2}}}{9}\] |
| C. | \[\frac{3{{u}^{2}}}{9}\] |
| D. | \[\frac{4{{u}^{2}}}{9}\] |
| Answer» E. | |
| 996. |
Find the ratio of the distances travelled by a body falling freely from rest in the first, second and third seconds respectively. |
| A. | \[1:4:9\] |
| B. | \[1:2:3\] |
| C. | \[1:9:25\] |
| D. | \[1:3:5\] |
| Answer» E. | |
| 997. |
A body weighs \[700\,\,N\] on the surface of the earth. What is its weight on the surface of a planet/whose mass is \[1/7\,\,th\] and radius is \[1/2\] as that of the earth? |
| A. | \[400\,\,N\] |
| B. | \[300\,\,N\] |
| C. | \[700\,\,N\] |
| D. | \[500\,\,N\] |
| Answer» B. \[300\,\,N\] | |
| 998. |
Two spheres each of mass \[105\,\,kg\] and radius \[10\,\,m\] are kept in contact. Find the force of gravitation acting between them. |
| A. | \[{{10}^{-3}}N\] |
| B. | \[6.67\times {{10}^{-3}}N\] |
| C. | \[6.67\times {{10}^{-11}}N\] |
| D. | \[{{10}^{-11}}N\] |
| Answer» C. \[6.67\times {{10}^{-11}}N\] | |
| 999. |
A body weighs \[72\,\,N\] on the surface of the earth. What is the gravitational force on it at a height equal to half the radius of the earth from the surface? |
| A. | \[72\,\,N\] |
| B. | \[28\,\,N\] |
| C. | \[16\,\,N\] |
| D. | \[32\,\,N\] |
| Answer» E. | |
| 1000. |
A cyclist covers the distance of 6 km in 15 minutes. Find his speed? |
| A. | 20 km/h |
| B. | 22 km/h |
| C. | 24 km/h |
| D. | 28 km/h |
| E. | None of these |
| Answer» D. 28 km/h | |