MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a concave lens has a focal of 10 cm. At what distance should the object from the lens be placed so that it forms an image at 5 cm from the lens? |
| A. | 5 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 10 cm |
| Answer» E. | |
| 2. |
A magnifying glass is also called |
| A. | compound microscope |
| B. | simple microscope |
| C. | single curved lens |
| D. | electronic microscope |
| Answer» C. single curved lens | |
| 3. |
The mirror used in headlights is |
| A. | parabolic |
| B. | silvered |
| C. | plane |
| D. | hyperbolic |
| Answer» B. silvered | |
| 4. |
The SI unit for the power of lens is |
| A. | Watt |
| B. | Diopter |
| C. | Meter |
| D. | Seconds |
| Answer» C. Meter | |
| 5. |
A mirror whose inner curved surface is reflecting is |
| A. | concave mirror |
| B. | convex mirror |
| C. | concave lens |
| D. | convex lens |
| Answer» B. convex mirror | |
| 6. |
Any transparent material having two surfaces of which at least one is curved is called |
| A. | endoscope |
| B. | lens |
| C. | light pipe |
| D. | microscope |
| Answer» C. light pipe | |
| 7. |
If the object is towards the left side of the lens, it is said to be |
| A. | real object |
| B. | virtual object |
| C. | small object |
| D. | thick object |
| Answer» B. virtual object | |
| 8. |
When light travels in water or glass, its speed |
| A. | increases |
| B. | remains constant |
| C. | becomes zero |
| D. | decreases |
| Answer» E. | |
| 9. |
The condition in which the image is formed behind the retina is called |
| A. | Farsightedness |
| B. | Nearsightedness |
| C. | image defect |
| D. | blind spotting |
| Answer» B. Nearsightedness | |
| 10. |
A lens which converges the incident rays on a single point is |
| A. | convex lens |
| B. | concave lens |
| C. | biconcave lens |
| D. | bioconvex lens |
| Answer» B. concave lens | |
| 11. |
As the focal length of a convex lens is positive, therefore its power should be |
| A. | always zero |
| B. | also positive |
| C. | negative |
| D. | none of above |
| Answer» C. negative | |
| 12. |
The incident ray, the normal and the refracted ray at the point of incidence all lie in the same plane. This is the law of |
| A. | reflection |
| B. | refraction |
| C. | defraction |
| D. | acoustics |
| Answer» C. defraction | |
| 13. |
The radius of the sphere of which spherical mirror is a part is known as |
| A. | radius of curvature |
| B. | pole |
| C. | center of curvature |
| D. | focal length |
| Answer» B. pole | |
| 14. |
A voltage with square waveform having values of +5V and 0V is |
| A. | Wi-Fi signal |
| B. | current signal |
| C. | digital signal |
| D. | analogue signal |
| Answer» D. analogue signal | |
| 15. |
When a HIGH level is applied to an inverter, on its output appears |
| A. | LOW level |
| B. | HIGH level |
| C. | ZERO level |
| D. | none of above |
| Answer» B. HIGH level | |
| 16. |
NAND operation is simply AND operation followed by |
| A. | OR |
| B. | NOR |
| C. | AND |
| D. | NOT |
| Answer» E. | |
| 17. |
The particles emitted from hot cathode surface are |
| A. | negative ions |
| B. | positive ions |
| C. | protons |
| D. | electrons |
| Answer» E. | |
| 18. |
The electronic circuit which implements the NOT operation is known as |
| A. | AND gate |
| B. | OR gate |
| C. | NAND gate |
| D. | NOT gate |
| Answer» E. | |
| 19. |
The states of binary variables are usually represented by the digits |
| A. | 0, 1 |
| B. | 1, 2 |
| C. | 1, 10 |
| D. | 0, 10 |
| Answer» B. 1, 2 | |
| 20. |
The negatively charged particles in cathode rays are known as |
| A. | electrons |
| B. | neutrons |
| C. | protons |
| D. | photons |
| Answer» B. neutrons | |
| 21. |
Set of inputs and outputs in binary form is called |
| A. | binary set |
| B. | logic set |
| C. | truth table |
| D. | all of above |
| Answer» D. all of above | |
| 22. |
ADC circuit converts |
| A. | digital to analogue signals |
| B. | analogue to digital signals |
| C. | radio signals to analogue signals |
| D. | digital to discrete signals |
| Answer» C. radio signals to analogue signals | |
| 23. |
For the particular value of the angle of incidence, the angle of refraction becomes |
| A. | 30 ° |
| B. | 45 ° |
| C. | 90 ° |
| D. | 60 ° |
| Answer» D. 60 ° | |
| 24. |
The branch of optics that focuses on the creation of images is called |
| A. | geometric lenses |
| B. | retinal branch |
| C. | geometrical optics |
| D. | fiber optics |
| Answer» D. fiber optics | |
| 25. |
An eye is a refracting system containing a |
| A. | diverging lens |
| B. | converging lens |
| C. | mirror |
| D. | biconcave lens |
| Answer» C. mirror | |
| 26. |
An object is placed 5 cm in front of a concave mirror having a focal length 15 cm. The location of the image should be |
| A. | 9 cm |
| B. | 7.5 cm |
| C. | 8.6 cm |
| D. | 8 cm |
| Answer» C. 8.6 cm | |
| 27. |
The light is reflected by the prism through an angle of |
| A. | 30 ° |
| B. | 90 ° |
| C. | 90 ° |
| D. | 60 ° |
| Answer» C. 90 ° | |
| 28. |
If the power of a convex lens is 5D then at what distance the object should be placed from the lens so that its real and 2 times larger image is formed? |
| A. | 30 cm |
| B. | 20 cm |
| C. | 15 cm |
| D. | 25 cm |
| Answer» B. 20 cm | |
| 29. |
A smooth surface of silver reflects rays of light in |
| A. | many directions |
| B. | one direction |
| C. | two directions |
| D. | no direction |
| Answer» C. two directions | |
| 30. |
Lenses form images through |
| A. | reflection |
| B. | refraction |
| C. | defraction |
| D. | acoustics |
| Answer» C. defraction | |
| 31. |
The angle of incidence 45° is greater than the critical angle of the glass which is |
| A. | 42° |
| B. | 40° |
| C. | 30° |
| D. | 35° |
| Answer» B. 40° | |
| 32. |
An object 20 cm tall is located 14 cm from a concave mirror having focal length 20 cm. The height of the object is |
| A. | 35.6 cm |
| B. | 32.5 cm |
| C. | 50.8 cm |
| D. | 66.7 cm |
| Answer» E. | |
| 33. |
The equivalent resistance in a parallel resistance circuit when resistances are 2 &Omega, 3 Ω and 6 &Omega, and V = 6 V is |
| A. | 2 Ω |
| B. | 3 Ω |
| C. | 1 Ω |
| D. | 4 Ω |
| Answer» D. 4 Ω | |
| 34. |
In metals, the current flows only due to |
| A. | electrons |
| B. | ions |
| C. | positive charges |
| D. | neutrons |
| Answer» B. ions | |
| 35. |
A current of 4 mA is flowing through a wire for 2 minutes, then the charge flowing through the wire will be |
| A. | 220 × 10-3C |
| B. | 180 × 10-3C |
| C. | 380 × 10-3C |
| D. | 480 × 10-3C |
| Answer» E. | |
| 36. |
The color of the neutral wire is |
| A. | red or brown |
| B. | green or yellow |
| C. | black or blue |
| D. | white or pink |
| Answer» D. white or pink | |
| 37. |
The low resistance causes the current to be |
| A. | very large |
| B. | small |
| C. | neutral |
| D. | zero |
| Answer» B. small | |
| 38. |
A source of electromotive force convert non-electrical energy into |
| A. | electrical energy |
| B. | heat energy |
| C. | light energy |
| D. | atomic energy |
| Answer» B. heat energy | |
| 39. |
The dissipation of electrical energy into other forms of energy as charges flow through the circuit is caused by |
| A. | electric field industry |
| B. | electric field |
| C. | electric shock |
| D. | potential difference |
| Answer» E. | |
| 40. |
Dry human skin has a resistance of |
| A. | 5000 ohms or more |
| B. | 2,000 ohms or more |
| C. | 10,000 ohms or more |
| D. | 6,000 ohms or more |
| Answer» D. 6,000 ohms or more | |
| 41. |
In series combination the current passing through each resistor is |
| A. | different |
| B. | same |
| C. | zero |
| D. | high |
| Answer» C. zero | |
| 42. |
The color of the terminal of the galvanometer that shows the negative polarity is |
| A. | red |
| B. | blue |
| C. | black |
| D. | green |
| Answer» D. green | |
| 43. |
In a cathode-rays tube, on the inner surface of the glass opposite the cathode, there formed a |
| A. | greenish glow |
| B. | bluish glow |
| C. | white glow |
| D. | yellowish glow |
| Answer» B. bluish glow | |
| 44. |
Some kind of rays were emitted from the cathode, called |
| A. | proton rays |
| B. | cathode rays |
| C. | isotope's rays |
| D. | emission rays |
| Answer» C. isotope's rays | |
| 45. |
A simple AND operation followed by a NOT operation is called |
| A. | NOR operation |
| B. | NAND operation |
| C. | OR operation |
| D. | NOT operation |
| Answer» C. OR operation | |
| 46. |
A signal that can have only two discrete values is |
| A. | digital signal |
| B. | analogue signal |
| C. | radio signal |
| D. | hybrid signal |
| Answer» B. analogue signal | |
| 47. |
The more negative potential in the electron gun, the more electrons will be |
| A. | repel |
| B. | attract |
| C. | destroy |
| D. | formed |
| Answer» B. attract | |
| 48. |
A compound microscope uses |
| A. | 2 lenses |
| B. | 1 lens |
| C. | 4 lenses |
| D. | 5 lenses |
| Answer» B. 1 lens | |
| 49. |
A spherical mirror whose inner curved surface is reflecting is called |
| A. | plane mirror |
| B. | convex mirror |
| C. | concave mirror |
| D. | silver mirror |
| Answer» D. silver mirror | |
| 50. |
The endoscope used to examine the throat is called |
| A. | cystoscope |
| B. | gastro-scope |
| C. | microscope |
| D. | bronchoscope |
| Answer» E. | |