MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A large tank filled with water to a height ?h? is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to \[\frac{h}{2}\] and from \[\frac{h}{2}\] to zero is [EAMCET (Engg.) 2003] |
| A. | \[\sqrt{2}\] |
| B. | \[\frac{1}{\sqrt{2}}\] |
| C. | If assertion is true but reason is false. |
| D. | \[\frac{1}{\sqrt{2}-1}\] |
| Answer» D. \[\frac{1}{\sqrt{2}-1}\] | |
| 2. |
The diagram shows a cup of tea seen from above. The tea has been stirred and is now rotating without turbulence. A graph showing the speed v with which the liquid is crossing points at a distance X from O along a radius XO would look like |
| A. | |
| B. | |
| C. | \[\sqrt{\frac{{{k}_{1}}}{{{k}_{2}}}}\] |
| D. | |
| Answer» E. | |
| 3. |
Which graph represents the variation of surface tension with temperature over small temperature ranges for water |
| A. | |
| B. | |
| C. | \[mgR\frac{{{n}^{2}}}{{{n}^{2}}+1}\] |
| Answer» C. \[mgR\frac{{{n}^{2}}}{{{n}^{2}}+1}\] | |
| 4. |
The weight of a body is 9.8 N at the place where g = 9.8 \[m{{s}^{-2}}\]. Its mass is [NDA] |
| A. | zero |
| B. | 9.8 kg |
| C. | Depends upon the direction of projection |
| D. | 1kg |
| Answer» E. | |
| 5. |
An astronaut in the orbit in a spacecraft feels weightlessness |
| A. | due to the absence of gravity inside |
| B. | due to the face that space craft has no energy |
| C. | \[\sqrt{\frac{2GM}{{{R}^{3}}}}\] |
| D. | their is no gravity outside |
| Answer» D. their is no gravity outside | |
| 6. |
Why do two ice blocks join to form one block when pressed together? [NDA] |
| A. | Melting point of ice is lowered with increase in pressure |
| B. | Melting point of ice increases with increase in pressure |
| C. | \[9{{V}_{e}}\] |
| D. | Melting point of ice is \[0{}^\circ C\] |
| Answer» B. Melting point of ice increases with increase in pressure | |
| 7. |
When a ship floats on water [NDA] |
| A. | it displaces no water |
| B. | the mass of water displaced is equal to the mass of the ship |
| C. | 11.2 km/sec |
| D. | the mass of water displaced is greater than the mass of the ship |
| Answer» E. | |
| 8. |
Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent [CDS] |
| A. | reduces drastically the surface tension between water and oil |
| B. | increases the surface tension between water and oil |
| C. | Zero |
| D. | decreases the viscosity in detergent mixed water |
| Answer» B. increases the surface tension between water and oil | |
| 9. |
A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will [CDS] |
| A. | remain unaffected |
| B. | be reduced to half the earlier pressure |
| C. | I and IV |
| D. | be reduced to one-fourth the earlier pressure |
| Answer» B. be reduced to half the earlier pressure | |
| 10. |
Flow velocities in an incompressible fluid can be measured with which one of the following? [NDA] |
| A. | Barometer |
| B. | Venturi tube |
| C. | R/4 |
| D. | Manometer |
| Answer» C. R/4 | |
| 11. |
Assertion: The value of 'g' is greater at the equator than at the poles. Reason: Radius is more at the equator than at the poles. |
| A. | If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. |
| B. | If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. |
| C. | \[\frac{mgR}{2}\] |
| D. | If Assertion is incorrect but Reason is correct. |
| Answer» E. | |
| 12. |
The substance which exhibits practically no elastic effect is |
| A. | rubber |
| B. | quartz |
| C. | Increase by 2% |
| D. | Cu |
| Answer» C. Increase by 2% | |
| 13. |
An artificial satellite orbiting the earth does not fall down because the earth's attraction |
| A. | is balanced by the attraction of the moon |
| B. | vanishes at such distances |
| C. | \[{{R}^{5/2}}\] |
| D. | produces the necessary acceleration of its motion in a curved path |
| Answer» E. | |
| 14. |
If the radius of the earth were to shrink by one percent, its mass remaining the same, the value of g on the earth's surface would: [IAS Prelim] |
| A. | increase by 0.5% |
| B. | increase by 2% |
| C. | If assertion is true but reason is false. |
| D. | decrease by 2% |
| Answer» C. If assertion is true but reason is false. | |
| 15. |
A liquid flows in a tube from left to right as shown in figure. \[{{A}_{1}}\] and \[{{A}_{2}}\] are the cross-sections of the portions of the tube as shown. Then the ratio of speeds \[{{v}_{1}}/{{v}_{2}}\] will be |
| A. | \[{{A}_{1}}/{{A}_{2}}\] |
| B. | \[{{A}_{2}}/{{A}_{1}}\] |
| C. | If assertion is true but reason is false. |
| D. | \[\sqrt{{{A}_{1}}}/\sqrt{{{A}_{2}}}\] |
| Answer» C. If assertion is true but reason is false. | |
| 16. |
In a laminar flow the velocity of the liquid in contact with the walls of the tube is |
| A. | Zero |
| B. | Maximum |
| C. | If assertion is true but reason is false. |
| D. | Equal to critical velocity |
| Answer» B. Maximum | |
| 17. |
A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is [EAMCET (Med.) 2003] |
| A. | 0.1 |
| B. | 0.05 |
| C. | Increases |
| D. | 0.0005 |
| Answer» E. | |
| 18. |
In which one of the following cases will the liquid flow in a pipe be most streamlined [Pb. CET 2005] |
| A. | Liquid of high viscosity and high density flowing through a pipe of small radius |
| B. | Liquid of high viscosity and low density flowing through a pipe of small radius |
| C. | \[\frac{g}{4}\] |
| D. | Liquid of low viscosity and high density flowing through a pipe of large radius |
| Answer» C. \[\frac{g}{4}\] | |
| 19. |
A block of ice floats on a liquid of density 1.2in a beaker then level of liquid when ice completely melt [IIT-JEE 1994] |
| A. | Remains same |
| B. | Rises |
| C. | dR |
| D. | (a), (b) or (c) |
| Answer» C. dR | |
| 20. |
Two capillaries made of same material but of different radii are dipped in a liquid. The rise of liquid in one capillary is 2.2 cm and that in the other is 6.6 cm. The ratio of their radii is [MP PET 1990] |
| A. | 0.37569444444444 |
| B. | 1 : 9 |
| C. | 72 N |
| D. | 1 : 3 |
| Answer» D. 1 : 3 | |
| 21. |
Water rises up to a height h in a capillary tube of certain diameter. This capillary tube is replaced by a similar tube of half the diameter. Now the water will rise to the height of [Kerala PMT 2005] |
| A. | 4h |
| B. | 3h |
| C. | Will remain the same |
| D. | H |
| Answer» D. H | |
| 22. |
Radius of a capillary is \[2\times {{10}^{-3}}m.\] A liquid of weight \[6.28\times {{10}^{-4}}N\] may remain in the capillary then the surface tension of liquid will be [RPET 2003] |
| A. | \[5\times {{10}^{-3}}N/m\] |
| B. | \[5\times {{10}^{-2}}N/m\] |
| C. | \[\frac{{{g}_{1}}}{{{g}_{2}}}=\frac{R_{1}^{2}}{R_{2}^{2}}\] |
| D. | \[50\,N/m\] |
| Answer» C. \[\frac{{{g}_{1}}}{{{g}_{2}}}=\frac{R_{1}^{2}}{R_{2}^{2}}\] | |
| 23. |
In the state of weightlessness, a capillary tube is dipped in water, then water |
| A. | Will not rise at all |
| B. | Will rise to same height as at atmospheric pressure |
| C. | 1 |
| D. | Will rise up to the upper end of the capillary tube of any length |
| Answer» E. | |
| 24. |
The action of a nib split at the top is explained by [JIPMER 1999] |
| A. | Gravity flow |
| B. | Diffusion of fluid |
| C. | \[x=\frac{h}{2}\] |
| D. | Osmosis of liquid |
| Answer» D. Osmosis of liquid | |
| 25. |
A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is (S.T. of water =75 dyne/cm, g =1000 cm/s2) [CPMT 1989; J&K CET 2004] |
| A. | 100 cm |
| B. | 75 cm |
| C. | |
| D. | 30 cm |
| Answer» E. | |
| 26. |
Assertion : Terminal velocity is same as the critical velocity. Reason : The constant velocity of fall of a body through a viscous fluid is called terminal velocity. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | 10 kg |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 27. |
Assertion : A rain drop after falling through some height attains a constant velocity. Reason : At constant velocity, the viscous drag is just equal to its weight. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | because acceleration in the orbit is equal to acceleration of gravity outside |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 28. |
Assertion : A fluid flowing out of a small hole in a vessel apply a backward thrust on the vessel. Reason : According to equation of continuity, the product of area and velocity remain constant. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | Melting point of ice remains unchanged with increase in pressure |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 29. |
Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter. Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | the mass of water displaced is lesser than the mass of the ship |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 30. |
Assertion : It is easier to spray water in which some soap is dissolved. Reason : Soap is easier to spread. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | increases the viscosity of water and oil |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 31. |
A liquid is coming out from a vertical tube. The relation between the weight of the drop W, surface tension of the liquid T and radius of the tube r is given by, if the angle of contact is zero |
| A. | \[W=\pi {{r}^{2}}T\] |
| B. | \[W=2\pi rT\] |
| C. | be increased to twice the earlier pressure |
| D. | \[W=\frac{3}{4}\pi {{r}^{3}}T\] |
| Answer» C. be increased to twice the earlier pressure | |
| 32. |
A liquid does not wet the sides of a solid, if the angle of contact is [MP PAT 1990; AFMC 1988; MNR 1998; RPMT 1999, 2003; Pb. PMT 2002 KCET 2005] |
| A. | Zero |
| B. | Obtuse (More than\[90{}^\circ \]) |
| C. | Strain gauge |
| D. | \[90{}^\circ \] |
| Answer» C. Strain gauge | |