MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the focal length of the biconvex lens is 25 cm, then the power of the lens will be [NDA] |
| A. | + 4 dioptre |
| B. | - 4 dioptre |
| C. | When speed of motor increases |
| D. | - 0.04 dioptre |
| Answer» B. - 4 dioptre | |
| 2. |
Assertion [A]: A myopic person is advised to use concave lens.Reason [R]: The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina. [NDA] |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is NOT the correct explanation of A |
| C. | Motor has just started moving |
| D. | A is false but R is true |
| Answer» B. Both A and R are individually true but R is NOT the correct explanation of A | |
| 3. |
Consider the following statements [CDS] 1. Clear sky appears blue due to poor scattering of blue wavelength of visible light. 2. Red part of light shows more scattering than blue light in the atmosphere. 3. In the absence of atmosphere, there would be no scattering of light and sky will look black. Which of the statements given above is/are correct? |
| A. | Only 1 |
| B. | 1 and 2 |
| C. | Fluctuating dc |
| D. | All of these |
| Answer» D. All of these | |
| 4. |
Two pieces of conductor of same material and of equal length are connected in series with a cell. One of the two pieces has cross-sectional area double that of the other. Which one of the following statements is correct in this regard? [NDA] |
| A. | The thicker one will allow stronger current to pass through it. |
| B. | The thinner one would allow stronger current to pass through it. |
| C. | Four times |
| D. | Same amount of electric current would pass through both the pieces producing more heat in the thinner one. |
| Answer» E. | |
| 5. |
The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct? [NDA] |
| A. | 110 V is safer but more expensive to maintain |
| B. | 110 V is safer and cheaper to maintain |
| C. | Dynamo |
| D. | 110 V works better at higher latitudes |
| Answer» B. 110 V is safer and cheaper to maintain | |
| 6. |
An electric lamp of 100 watt is used for 10 hours per day. The 'units' of energy consumed in one day by the lamp is [NDA] |
| A. | 1 unit |
| B. | 0.1 unit |
| C. | 60c/s |
| D. | 100 units |
| Answer» B. 0.1 unit | |
| 7. |
The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for [NDA] |
| A. | a microscope |
| B. | a telescope |
| C. | \[{{I}_{rms}}=\frac{1}{\pi }{{I}_{0}}\] |
| D. | neither microscope nor telescope |
| Answer» C. \[{{I}_{rms}}=\frac{1}{\pi }{{I}_{0}}\] | |
| 8. |
An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image? [NDA] |
| A. | Virtual, not magnified |
| B. | Virtual, magnified |
| C. | mutual induction |
| D. | Real, magnified |
| Answer» C. mutual induction | |
| 9. |
A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens? [NDA] |
| A. | - 0.8 D |
| B. | - 3.0 D |
| C. | the rotation of the armature causes the field through it to reverse |
| D. | + 3.0 D |
| Answer» E. | |
| 10. |
When light waves travel from air to glass, which variables are affected? [NDA] |
| A. | Wavelength, frequency and velocity |
| B. | Velocity and frequency only |
| C. | electrical energy into light energy |
| D. | Wavelength and velocity only |
| Answer» E. | |
| 11. |
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of [NDA] |
| A. | reflection of light |
| B. | refraction of light |
| C. | increases heavily |
| D. | interference of light |
| Answer» C. increases heavily | |
| 12. |
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as [NDA] |
| A. | resistance R |
| B. | heat generated by the circuit |
| C. | AC generator will generate a higher voltage |
| D. | rate of change of resistance |
| Answer» D. rate of change of resistance | |
| 13. |
If the electrical resistance of a typical substance suddenly drops to zero then the substance is called [NDA] |
| A. | superconductor |
| B. | semiconductor |
| C. | in both DC and AC circuits |
| D. | insulator |
| Answer» B. semiconductor | |
| 14. |
Graphene is frequently in news recently. What is its importance? [IAS Prelim] 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct? |
| A. | 1 and 2 only |
| B. | 3 and 4 only |
| C. | motor |
| D. | 1, 2, 3 and 4 |
| Answer» D. 1, 2, 3 and 4 | |
| 15. |
Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must [NDA] |
| A. | have different cross-sections |
| B. | have different temperatures |
| C. | metals to become hard |
| D. | be of same density |
| Answer» D. be of same density | |
| 16. |
Match List I with List II and select the correct answer using the code given below the Lists: [NDA] List I(Magnet) List II(Property) A. Artificial magnet1. Long lived B. Permanent magnet2. Last for infinitely long period C. Temporary magnet3. Short lived D. Earth as a magnet4. Induced magnet |
| A. | A-3, B-1, C-4, D-2 |
| B. | A-3, B-4, C-1, D-2 |
| C. | exactly in the middle of anode and cathode |
| D. | A-2, B-4, C-1, D-3 |
| Answer» B. A-3, B-4, C-1, D-2 | |
| 17. |
Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth? [IAS Prelim] |
| A. | The Earth's magnetic field diverts them towards its poles |
| B. | Ozone layer around the Earth reflects them back to outer space |
| C. | chemical |
| D. | None of the statements [a], [b] and [c] given above is correct |
| Answer» B. Ozone layer around the Earth reflects them back to outer space | |
| 18. |
Fluorescent tubes are fitted with a choke. The choke coil: [IAS Prelim] |
| A. | steps up the line voltage |
| B. | steps-down the line voltage |
| C. | material |
| D. | chokes low frequency current |
| Answer» D. chokes low frequency current | |