MCQOPTIONS
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MCQOPTIONS
This section includes 22 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 person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls [EAMCET (Med.) 1995; MH CET 2003;BCECE 2004] |
| A. | Outside the car |
| B. | In the car ahead of the person |
| C. | A parabola |
| D. | Exactly in the hand which threw it up |
| Answer» E. | |
| 2. |
A mass of 1 kg is suspended by a string A. Another string C is connected to its lower end (see figure). If a sudden jerk is given to C, then |
| A. | The portion AB of the string will break |
| B. | The portion BC of the string will break |
| C. | Einstein |
| D. | The mass will start rotating |
| Answer» C. Einstein | |
| 3. |
The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is [KCET 2002] |
| A. | \[{{60}^{\text{o}}}\] |
| B. | \[{{120}^{\text{o}}}\] |
| C. | Remains unchanged |
| D. | \[{{90}^{\text{o}}}\] |
| Answer» C. Remains unchanged | |
| 4. |
Two forces of magnitude F have a resultant of the same magnitude F. The angle between the two forces is [CBSE PMT 1990] |
| A. | \[45{}^\circ \] |
| B. | \[120{}^\circ \] |
| C. | If assertion is true but reason is false. |
| D. | \[{{60}^{\text{o}}}\] |
| Answer» C. If assertion is true but reason is false. | |
| 5. |
If two forces of 5 N each are acting along X and Y axes, then the magnitude and direction of resultant is [DCE 2004] |
| A. | \[5\sqrt{2},\,\,\pi /3\] |
| B. | \[5\sqrt{2},\,\,\pi /4\] |
| C. | If assertion is true but reason is false. |
| D. | \[-5\sqrt{2},\,\,\pi /4\] |
| Answer» C. If assertion is true but reason is false. | |
| 6. |
Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of \[2m/{{s}^{2}}\] in the upward direction in both the blocks. If T and \[{T}'\] be the tensions in the two parts of the string, then [AMU (Engg.) 2000] |
| A. | \[T=70.8N\] and \[{T}'=47.2N\] |
| B. | \[T=58.8N\] and \[{T}'=47.2N\] |
| C. | If assertion is true but reason is false. |
| D. | \[T=70.8N\] and \[{T}'=0\] |
| Answer» B. \[T=58.8N\] and \[{T}'=47.2N\] | |
| 7. |
The weight of an aeroplane flying in the air is balanced by [NCERT 1974] |
| A. | Vertical component of the thrust created by air currents striking the lower surface of the wings |
| B. | Force due to reaction of gases ejected by the revolving propeller |
| C. | C |
| D. | Force due to the pressure difference between the upper and lower surfaces of the wings created by different air speeds on the surfaces |
| Answer» E. | |
| 8. |
When forces \[{{F}_{1}},\,{{F}_{2}},\,{{F}_{3}}\] are acting on a particle of mass m such that \[{{F}_{2}}\] and \[{{F}_{3}}\] are mutually perpendicular, then the particle remains stationary. If the force \[{{F}_{1}}\] is now removed then the acceleration of the particle is [AIEEE 2002] |
| A. | \[{{F}_{1}}/m\] |
| B. | \[{{F}_{2}}{{F}_{3}}/m{{F}_{1}}\] |
| C. | |
| D. | \[{{F}_{2}}/m\] |
| Answer» B. \[{{F}_{2}}{{F}_{3}}/m{{F}_{1}}\] | |
| 9. |
What is the maximum value of the force F such that the block shown in the arrangement, does not move [IIT-JEE Screening 2003] |
| A. | 20 N |
| B. | 10 N |
| C. | 25.5m |
| D. | 15 N |
| Answer» B. 10 N | |
| 10. |
A ship of mass \[3\times {{10}^{7}}\,kg\] initially at rest is pulled by a force of \[5\times {{10}^{4}}\,N\] through a distance of 3 m. Assume that the resistance due to water is negligible, the speed of the ship is [IIT 1980; MP PMT 2000] |
| A. | 1.5 m/s |
| B. | 60 m/s |
| C. | If assertion is true but reason is false. |
| D. | 5 m/s |
| Answer» D. 5 m/s | |
| 11. |
A flat plate moves normally with a speed \[{{v}_{1}}\] towards a horizontal jet of water of uniform area of cross-section. The jet discharges water at the rate of volume V per second at a speed of \[{{v}_{2}}\]. The density of water is \[\rho \]. Assume that water splashes along the surface of the plate at right angles to the original motion. The magnitude of the force acting on the plate due to the jet of water is [IIT 1995] |
| A. | \[\rho V{{v}_{1}}\] |
| B. | \[\rho V({{v}_{1}}+{{v}_{2}})\] |
| C. | If assertion is true but reason is false. |
| D. | \[\rho \left[ \frac{V}{{{v}_{2}}} \right]{{({{v}_{1}}+{{v}_{2}})}^{2}}\] |
| Answer» E. | |
| 12. |
A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by [IIT-JEE 2001] |
| A. | \[\sqrt{2}Mg\] |
| B. | \[\sqrt{2}mg\] |
| C. | If assertion is true but reason is false. |
| D. | \[\sqrt{{{(M+m)}^{2}}+{{M}^{2}}}g\] |
| Answer» E. | |
| 13. |
An insect crawls up a hemispherical surface very slowly (see the figure). The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemispherical surface to the insect makes an angle \[\alpha \]with the vertical, the maximum possible value of \[\alpha \] is given by [IIT-JEE 2001] |
| A. | \[\cot \alpha =3\] |
| B. | \[\tan \alpha =3\] |
| C. | If assertion is true but reason is false. |
| D. | \[\text{cosec}\,\alpha =\text{3}\] |
| Answer» B. \[\tan \alpha =3\] | |
| 14. |
A vessel containing water is given a constant acceleration a towards the right, along a straight horizontal path. Which of the following diagram represents the surface of the liquid [IIT 1981] |
| A. | A |
| B. | B |
| C. | \[6.0\times {{10}^{-18}}Joule\] |
| D. | D |
| Answer» D. D | |
| 15. |
A bullet mass 10 gm is fired from a gun of mass 1kg. If the recoil velocity is 5 m/s, the velocity of the muzzle is [Orissa JEE 2002] |
| A. | 0.05 m/s |
| B. | 5 m/s |
| C. | 30 min |
| D. | 500 m/s |
| Answer» E. | |
| 16. |
A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. by what velocity the gun rebounds backwards [CBSE PMT 1996; JIPMER 2000] |
| A. | 0.1 m/s |
| B. | 10 m/s |
| C. | 24 hours |
| D. | 0.01 m/s |
| Answer» D. 0.01 m/s | |
| 17. |
A rope of length 5m is kept on frictionless surface and a force of 5N is applied to one of its end. Find tension in the rope at 1m from this end [RPET 2000] |
| A. | 1 N |
| B. | 3 N |
| C. | \[{{10}^{5}}K\] |
| D. | 5 N |
| Answer» D. 5 N | |
| 18. |
A jet plane flies in the air because [NCERT 1971] |
| A. | The gravity does not act on bodies moving with high speeds |
| B. | The thrust of the jet compensates for the force of gravity |
| C. | \[3.8\times {{10}^{12}}kg\] |
| D. | The weight of air whose volume is equal to the volume of the plane is more than the weight of the plane |
| Answer» C. \[3.8\times {{10}^{12}}kg\] | |
| 19. |
Assertion : The acceleration of a body down a rough inclined plane is greater than the acceleration due to gravity. Reason : The body is able to slide on a inclined plane only when its acceleration is greater than acceleration due to gravity. |
| 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. | \[_{55}^{133}Cs\] |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» E. If assertion is false but reason is true. | |
| 20. |
Assertion : If two objects of different masses have same momentum, the lighter body possess greater velocity. Reason : For all bodies momentum always remains same. |
| 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. | \[{{l}_{H}}={{l}_{Li}}\text{ and }|{{E}_{H}}|>|{{E}_{Li}}|\] |
| 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. | |
| 21. |
Assertion : A player lowers his hands while catching a cricket ball and suffers less reaction force. Reason : The time of catch increases when cricketer lowers its hand while catching a ball. |
| 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. | \[4\to 2\] |
| 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. | |
| 22. |
Assertion : A bullet is fired from a rifle. If the rifle recoils freely, the kinetic energy of rifle is more than that of the bullet. Reason : In the case of rifle bullet system the law of conservation of momentum violates. |
| 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. | 50/min, 12.5/min |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» E. If assertion is false but reason is true. | |