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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Maglev trains work based on `"_________"` |
| Answer» Correct Answer - Electronmaginetic induction | |
| 2. |
Choose an example from the following where action and reaction pair existsA. A book placed on a table.B. A person walking on the road.C. A 1 kg mass suspended to a spring balance.D. All the above |
| Answer» Correct Answer - D | |
| 3. |
Choose the incorrect one from the following.A. Electrical forces can be attractive (or) repulsive in nature and they are short range forces.B. Gravitational forces are attractive in nature and they are long range forcesC. Magnetic lines of force cannot exist with a single magnetic pole.D. The energy of flowing water is used to produce necessary force which runs a generator to produce electric current |
| Answer» Correct Answer - C | |
| 4. |
If a Lilliput in his sleeping position occupies an area of `5 cm^2` and on standing position occupies `2 cm^2 ` of area, then fmd the ratio of pressures exerted by him in béth the positions |
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Answer» Correct Answer - `2:5 ` `A_1 = 5cm^2 , A_2 = 2 cm^2` ` W_1 =W_2 = W` `P_1/P_2 = W_1/W_2xxA_2/A_1 = 1xx2/5 = 2/5` |
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| 5. |
Express 20 SI units of pressure in its CGS unit |
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Answer» Correct Answer - `200 "dyne"/cm^2` `20Pa = 20xx10^5 "dynes" (20^-4) cm^-2 = 20xx10 = 200 "dynes" cm^-2` |
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| 6. |
Electric force exists betweenA. Two massesB. Two magnetsC. Two electronsD. Two bodies |
| Answer» Correct Answer - C | |
| 7. |
Static friction is a `"______ "` force. |
| Answer» Correct Answer - Self-adjusting | |
| 8. |
How many atmospheric pressures is equal to the pressure of 2 kPa ? |
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Answer» Correct Answer - `2xx 10^(-2)` atm ` 2 kPa = 2000 Pa = 2000xx N/m^2 = 2000 Pa` `= 2xx 10^(+3)xx10^(-5)`atm `=2xx 10^(-2)` atm |
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| 9. |
ltimg src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PS_SCI_VI_C02_E05_001_Q01.png" width="80%"gt |
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Answer» Correct Answer - `{:("Across",|,"Down"),("2. Viscous drag is a ",|,"1. Pressure is a_____."),("6.Necessary thing for the existence of eletric force ",|,"3.What is the mass of 2 gram weight of a body ?"),(8. 10^5 P_a ,|,"4. Atmospheric pressure is measured in _______ "),("9. Force is a ",|,"5.Pressure acting is measured in _______."),("10.What is the SI unit of a force ? ",|,"7. How much is the leteral pressure differnce at a point inside a liquid ? "):}` `{:("Across",|,"Down"),("2. Viscous drag is a ",|,"1. Pressure is a_____."),("6.Necessary thing for the existence of eletric force ",|,"3.What is the mass of 2 gram weight of a body ?"),(8. 10^5 P_a ,|,"4. Atmospheric pressure is measured in _______ "),("9. Force is a ",|,"5.Pressure acting is measured in _______."),("10.What is the SI unit of a force ? ",|,"7. How much is the leteral pressure differnce at a point inside a liquid ? "):}` |
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| 10. |
Frictional force causesA. Wear and tear of a machineB. Energy loss in the form of heatC. Motion in a bodyD. Both (a) and (b) |
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Answer» Correct Answer - D Friciton itself a force which opposes the relative motion so it cannot bring a body into motion |
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| 11. |
Which of the following is not possible?A. Sliding friction can be converted into rolling frictionB. Rolling friction increases with area of contactC. Sliding friction can be converted into static frictionD. None of these |
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Answer» Correct Answer - C Sliding friction cannot be converted to static friction. |
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| 12. |
A child is trying to drag water tin but fails becauseA. Applied force is not sufficient.B. Applied force is cancelled by frictional force.C. Static friction is not sufficientD. Both (a) and (b) |
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Answer» Correct Answer - D The child fails to pull the water tin because the applied force is less than the static friction acting between the suface of body and the surface on which it is placed. |
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| 13. |
Express 1 MN in dynes |
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Answer» Correct Answer - 1011 dynes `1M = 10^6N = 10^6xx10^5 "dynes" = 10^11` |
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| 14. |
Does anybody exsit without and force acting on ot ? |
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Answer» Correct Answer - Zero No, a body can exist with zero net force acting on it. Here more than two forces act on it but the resultant of all the forces can be zero. |
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| 15. |
Air friction can be reduced by `"_______"` the shape of the objects. |
| Answer» Correct Answer - Streamlining | |
| 16. |
Force of friction cannot be reduced byA. Ball bearingsB. LubricantsC. Smoothening the surfaceD. Increasing the weight of body |
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Answer» Correct Answer - D Force of Eiction cannot be reduced by increasing the weight of the body because increasing weight increases the interlocking between the two sur faces in contact. |
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| 17. |
Which of these is not a unit of force?A. Kilogram forceB. NewtonC. Gram weightD. None of these |
| Answer» Correct Answer - D | |
| 18. |
An iron cylindar of base area `7 cm^2` and mass 10 kg is melted and reshaped into a into a rod of area of cross section `1cm^2`.Calculate the increase in the pressure exerted on a plane surface when both the cylinder and the rod are made to stand vertically on a plane surface `(g= 10m^(-2))`A. `100 xx 10^4` paB. `10 xx 10^4`PaC. `14.28 xx 10^4 Pa`D. `85.72 xx 10^4 Pa` |
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Answer» Correct Answer - D Give , mass of cylinder , `m_c = 10kg` Base area of the cylinder , `A_c = 7 cm^2 = 7xx(10^-2)^2 = 7xx10^-4m^2` Pressure due to cylinder . `P_c = F_c/A_c = (m_cg)/A_c = (10xx10)/(7xx10^-4) = 14.28xx10^4 Pa` Mass of the rod , `m_r = 10 kg` Base area of the rod , `A_r =1cm^2 = 1xx(10^-2)^2 = 10^-4m^2` Pressure due to rod `P_r = F_r/A_r = (m_rg)/A_r = (10xx10)/10^-4 = 100xx10^4 Pa` Pressure due to `P_r-P_r=(100-14.28) xx 10^4)` Pa Hence the correct option is (d) |
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| 19. |
What is the gravitaional force acting on 2 kg mass ? [Take g = 10ms^(-2)`] |
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Answer» Correct Answer - 20 N Gravination force , mg = `2xx10 = 20 N ` |
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| 20. |
On a block of mass 10 kg a child applied a force of 5 N .Explain the position of block and kind of friction action on it . |
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Answer» Correct Answer - No, the block does not move ,static friction . No, the block does not move because for 5 N applied force the same amount of static friction force acts on the body in opposite direction. Therefore, the net force acting on the body is zero |
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| 21. |
P amount of lateral pressure is applied on either sides of a cuboidal dough horizontally. The length of the dough is reduced to half resulting change only in the height, then fmd the pressure applied by the dough at the bottom of it. |
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Answer» Correct Answer - `2P_1` `P_(1)=mg/lxxb` `P_(2)=(mg)/(l/2 xx b)` `P_(2)=2P_(1)` |
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| 22. |
Which of the following acts on a body from a very .far distance?A. Electric forceB. Magnetic forceC. Gravitational forceD. Frictional force |
| Answer» Correct Answer - C | |
| 23. |
If the spring balance graded in gravitational units (CGS syste1n) shows 20 as the reading, then mass of the body is `"________"` kg. |
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Answer» Correct Answer - 20 gf mass =20 grms =0.02 kg 20 gf Mass = 20 grams = 0.02 kg |
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| 24. |
Akash can can move an iron block at rest ,placed on a metal sheet by pushing it with a force of 50 N.When a lubricant is applied on the effort is reduced to do the same activity .The force with which the block can be moved in the second case is `"________"`.A. 25 NB. 37.5NC. 12.5 ND. 50 N |
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Answer» Correct Answer - B Intial force applied to move the block F= 50 N When the lubricant is applied ,one fourth of the effort is reduced . Therefore , the force applied to move the block is `F=F-F/4= 50 - 50/4` =50- 12.5= 37.5 N Hence , the correct option is (b) |
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| 25. |
5 pa os pressure is required to be exerted on an are of ` 250 m^2` .A box is placed on that area and the surface of cantact is exactly `250 m^2` .What should be the mass of the box so that exactly 5 pa of pressure can be exerted ? |
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Answer» `Pressure ="Force"/"Area" ` `5 = "Force "/250 (1 "pa" = 1 N//m ^2)` `therefore` R reqired force = 1250 N Let m be the mass of the object `therefore m xx g = 1250` `therefore m xx 10=1250` `therefore m= 1250/10 kg = 125 kg " "(because g ~~ 10 m s^(-2))` |
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| 26. |
Chosse the case where minimum friction acts (A) when a person walks on the road. ( b) When a person walks on sand floor. ( c) When a person walks on sand floor. |
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Answer» Correct Answer - Hence , the correct option is ( b) Option (b) is correct because a person walking on tile wet marble Hoor experiences minimum fric-tional force, so he has more scope to slip on the floor Hence, the correct option is (b) |
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| 27. |
One atm =`"________"`. |
| Answer» Correct Answer - `10^5 PA` | |
| 28. |
Two constant forces 4 N and 5 N act on a body in opposite directions .Find the resultant force on the body |
| Answer» As the two forces are in opposite directions , their resultant force is equal to difference of those two forces i.e, `F_R=5-4= 1N` and acts in the directions of 5 N force. | |