MCQOPTIONS
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MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your 10th knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? DiffusionRefractionInternal reflection |
| A. | I, II and III |
| B. | I and II |
| C. | II and III |
| D. | I and III |
| Answer» D. I and III | |
| 2. |
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will |
| A. | move towards A |
| B. | move towards B |
| C. | move at right angles to the line joining A and B |
| D. | remain at rest |
| Answer» C. move at right angles to the line joining A and B | |
| 3. |
out of the following, which is not emitted by radioactive substance? |
| A. | Electrons |
| B. | Electromagnetic radiations |
| C. | Alpha particles |
| D. | Neutrons |
| Answer» E. | |
| 4. |
Optical fibre works on the |
| A. | principle of refraction |
| B. | total internal reflection |
| C. | scattering |
| D. | interference |
| Answer» C. scattering | |
| 5. |
When two semiconductors of p-type and N-type are brought in contact with each other the PN junction formed behaves like |
| A. | an oscillator |
| B. | a condenser |
| C. | an amplifier |
| D. | a conductor |
| Answer» C. an amplifier | |
| 6. |
NOR gate is a combination of |
| A. | OR gate and NOT gate |
| B. | Or gate and AND gate |
| C. | OR gate and OR gate |
| D. | AND gate only |
| Answer» E. | |
| 7. |
A radioactive substance has half life of four months. Three fourth of the substance will decay in |
| A. | 3 months |
| B. | 4 months |
| C. | 12 months |
| D. | 8 months |
| Answer» E. | |
| 8. |
The helium atom does not contain |
| A. | 2 protons |
| B. | 2 electrons |
| C. | 2 neutrons |
| D. | 6 nucleons |
| Answer» E. | |
| 9. |
What determines the penetrating power of X-rays? |
| A. | velocity |
| B. | frequency |
| C. | intensity |
| D. | density |
| Answer» C. intensity | |
| 10. |
What is the angle of dip at the magnetic poles? |
| A. | 0 o |
| B. | 30o |
| C. | 45o |
| D. | 90o |
| Answer» E. | |
| 11. |
A soap bubble is charged to a potential of 16V. Its radius is then doubled. The potential of the bubble now will be: |
| A. | 16V |
| B. | 8V |
| C. | 4V |
| D. | 2V |
| Answer» C. 4V | |
| 12. |
The force between two bar magnets whose centers are d metres apart is 4.8N. When the separation is made 2d the force is reduced to |
| A. | 2.4 N |
| B. | 1.2 N |
| C. | 0.6 N |
| D. | 0.3 N |
| Answer» E. | |
| 13. |
Ordinary light is |
| A. | plane polarised |
| B. | circularly polarised |
| C. | alliptically polarised |
| D. | unpolarised |
| Answer» E. | |
| 14. |
Calculate the temperature at which the RMS velocity of a hydrogen molecule will be equal to the orbital velocity of earth's satelite (i.e., 8 km/s) |
| A. | 514 x 103 k |
| B. | 5.14 x 103 k |
| C. | 51.4 x 103 k |
| D. | 514 k |
| Answer» C. 51.4 x 103 k | |
| 15. |
Number of molecules per unit volume of an ideal gas is ___________ |
| A. | PRT |
| B. | PN/RT |
| C. | PT/RN |
| D. | RN/KT |
| Answer» C. PT/RN | |
| 16. |
Calculate the universal gas constant for one gram molecule of gas. |
| A. | 8.31 J/mol-K |
| B. | 83.1 J/mol-K |
| C. | 8.31 x10-7 J/mol-K |
| D. | 83.1 x10-7 J/mol-K |
| Answer» B. 83.1 J/mol-K | |
| 17. |
Determine the volume occupied by 3.2grams of oxygen at 76cm of Hg and 27oC. (R=8.314x107 ergs/g mol-k) |
| A. | 2.461 cm3 |
| B. | 2461 cm3 |
| C. | 246.1 cm3 |
| D. | 24.61 cm3 |
| Answer» C. 246.1 cm3 | |
| 18. |
For the same pressure and density, the speed of sound is highest in a |
| A. | Monoatomic gas |
| B. | Diatomic gas |
| C. | Triatomic gas |
| D. | Polyatomic gas |
| Answer» B. Diatomic gas | |
| 19. |
A stone is dropped into a lake by a person from a 500 m high tower. He would hear the sound of after approximately. |
| A. | 10 s |
| B. | 11.5 s |
| C. | 14 s |
| D. | 21 s |
| Answer» C. 14 s | |
| 20. |
The acceleration due to gravity g on earth in 9.8 ms-2 . What would be the value of g for a planet whose size is the same as that of earth but the density in twice that of earth? |
| A. | 19.6 ms-2 |
| B. | 9.8 ms-2 |
| C. | 4.9 ms-2 |
| D. | 2.45 ms-2 |
| Answer» B. 9.8 ms-2 | |
| 21. |
A bullet of mass 10gm moving with a speed of 500 m/s gets embedded in a tree after penetrating 5cm into it. Calculate the average retarding force exerted by the wood on the bullet and the work done by the wood in bringing the bullet to stop. |
| A. | 25 N, 12.50 joule |
| B. | 250 N, 1250 joule |
| C. | 25 KN, 1.250 joule |
| D. | 25 KN, 1250 joule |
| Answer» E. | |
| 22. |
A body of mass 500gm is tied to one end of a string of length 1m and is whirled round in a horizontal circle making 2 revolutions per second. Calculate the tension in the string. |
| A. | 78.88 N |
| B. | 7.888 N |
| C. | 0.7888 N |
| D. | 7888 N |
| Answer» B. 7.888 N | |
| 23. |
An aeroplane travelling at a speed of 500 kmph tilts at an angle of 30o as it makes a turn. What is the radius of the curve? |
| A. | 341 km |
| B. | 3.41 km |
| C. | 0.341 km |
| D. | 34.1 km |
| Answer» C. 0.341 km | |
| 24. |
A motor boat moves at a steady speed of 8m/s. If the water resistance to the motion of the boat is 2000W, calculate the power of the engine. |
| A. | 16000 W |
| B. | 1600 W |
| C. | 160 W |
| D. | 16 W |
| Answer» B. 1600 W | |