MCQOPTIONS
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MCQOPTIONS
This section includes 1134 Mcqs, each offering curated multiple-choice questions to sharpen your Grade10 knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
Sound energy passing per second through a unit area held perpendicular to the direction of propagation of sound waves is called |
| A. | loudness of sound |
| B. | pitch of sound |
| C. | quality of sound |
| D. | intensity of sound |
| Answer» E. | |
| 502. |
The time a sound wave having frequency 2 KHz and wavelength 35 cm requires to cover the distance of 1.5 Km is |
| A. | 2.1 s |
| B. | 10 s |
| C. | 20 s |
| D. | 8 s |
| Answer» B. 10 s | |
| 503. |
The pitch of the sound depends upon |
| A. | amplitude |
| B. | loudness |
| C. | area |
| D. | frequency |
| Answer» E. | |
| 504. |
Sound waves are mechanical because |
| A. | They require medium for propagation |
| B. | They don't require medium for propagation |
| C. | They are longitudinal |
| D. | They are transverse |
| Answer» B. They don't require medium for propagation | |
| 505. |
As compared to air, the speed of sound in liquids and solids is |
| A. | lower |
| B. | faster |
| C. | equal |
| D. | zero |
| Answer» C. equal | |
| 506. |
Echoes may be heard more than once due to successive or multiple reflections |
| A. | deflections |
| B. | defraction |
| C. | refractions |
| D. | reflections |
| Answer» E. | |
| 507. |
If the speed of the sound wave is 340ms-1 and wavelength is 0.5m then the frequency is |
| A. | 720Hz |
| B. | 680Hz |
| C. | 10Hz |
| D. | 240Hz |
| Answer» C. 10Hz | |
| 508. |
The wavelength of ultrasonic waves is |
| A. | more than audible sound |
| B. | less than audible sound |
| C. | equal to audible sound |
| D. | greater than light wave |
| Answer» D. greater than light wave | |
| 509. |
The difference between the loudness (L) of an unknown sound and the loudness Lo is known as |
| A. | intensity level of the unknown sound |
| B. | intensity level of the known sound |
| C. | quality of sound |
| D. | pitch of sound |
| Answer» B. intensity level of the known sound | |
| 510. |
The sound waves travel from its source by |
| A. | vibrations in wires or strings |
| B. | electromagnetic wave |
| C. | infrared wave |
| D. | changes in air pressure |
| Answer» E. | |
| 511. |
Ultrasonic waves carry more |
| A. | energy only |
| B. | frequency only |
| C. | heat |
| D. | energy and frequency |
| Answer» E. | |
| 512. |
The speed of sound in the liquid is |
| A. | 2 times that in gas |
| B. | 3 times that in gas |
| C. | 5 times that in gas |
| D. | 8 times that in gas |
| Answer» D. 8 times that in gas | |
| 513. |
If a normal conversation have sound intensities of 3×10-6Wm-2. The intensity of sound for 100dB would be |
| A. | 0.05 Wm-2 |
| B. | 0.01 Wm-2 |
| C. | 0.08 Wm-2 |
| D. | 0.68 Wm-2 |
| Answer» C. 0.08 Wm-2 | |
| 514. |
Intensities are scaled by factors of |
| A. | 20 |
| B. | 100 |
| C. | 10 |
| D. | 1000 |
| Answer» D. 1000 | |
| 515. |
The loudness of a sound is directly proportional to the |
| A. | logarithm of pitch |
| B. | logarithm of intensity |
| C. | vibration |
| D. | logarithm of quality |
| Answer» C. vibration | |
| 516. |
The characteristic of sound by which loud and faint sounds can be distinguished is |
| A. | Pitch |
| B. | Quality |
| C. | Frequency |
| D. | Loudness |
| Answer» E. | |
| 517. |
A human ear can hear sounds in the range |
| A. | 40-40,000 Hz |
| B. | 30-35 Hz |
| C. | 20-20,000 Hz |
| D. | 50-50,000 Hz |
| Answer» D. 50-50,000 Hz | |
| 518. |
In the convex mirror, the size of the image is always |
| A. | larger than object |
| B. | equal to object |
| C. | smaller than object |
| D. | moderate sized |
| Answer» D. moderate sized | |
| 519. |
The study of light behavior is called |
| A. | lenses |
| B. | optics |
| C. | mechanics |
| D. | heat |
| Answer» C. mechanics | |
| 520. |
In a compound microscope, the objective lens has |
| A. | large focal length |
| B. | less focal length than 1cm |
| C. | focal length equal to 1 cm |
| D. | no focal length |
| Answer» C. focal length equal to 1 cm | |
| 521. |
If the refractive index of water is 1.33 and of air is 1, the value of critical angle for water at 90° refracted angle should be |
| A. | 45° |
| B. | 48.8° |
| C. | 51.6° |
| D. | 59.8° |
| Answer» C. 51.6° | |
| 522. |
If an object is far from the eye, the deviation of light through the lens must be |
| A. | less |
| B. | greater |
| C. | zero |
| D. | none of above |
| Answer» B. greater | |
| 523. |
The condition in which image is formed in front of the retina is called |
| A. | Farsightedness |
| B. | Defect of vision |
| C. | nearsightedness |
| D. | blind spotting |
| Answer» D. blind spotting | |
| 524. |
The reflection by the smooth surfaces is called |
| A. | regular reflection |
| B. | irregular reflection |
| C. | regular refraction |
| D. | irregular refraction |
| Answer» B. irregular reflection | |
| 525. |
An optical instrument which is used to observe distant objects using lenses or mirrors is known as |
| A. | simple microscope |
| B. | compound microscope |
| C. | endoscope |
| D. | telescope |
| Answer» E. | |
| 526. |
The maximum distance of a distant object from the eye on which the fully relaxed eye can focus is called |
| A. | accommodation |
| B. | near point |
| C. | far point |
| D. | hypermetropia |
| Answer» D. hypermetropia | |
| 527. |
The ratio of the sine of the angle of incidence 'i’ to the sine of the angle of refraction 'r’ is always equal to |
| A. | constant |
| B. | variable |
| C. | zero |
| D. | 1 |
| Answer» B. variable | |
| 528. |
The size of the pupil is controlled by |
| A. | cornea |
| B. | chord |
| C. | retina |
| D. | iris |
| Answer» E. | |
| 529. |
The astronomical telescope, as is used to see distant |
| A. | astronomical objects |
| B. | sea objects |
| C. | earth objects |
| D. | none of above |
| Answer» B. sea objects | |
| 530. |
The angle of incidence that causes the refracted ray in the rare medium to bend through 90° is called |
| A. | symmetric angle |
| B. | critical angle |
| C. | complementary angle |
| D. | supplementary angle |
| Answer» C. complementary angle | |
| 531. |
The bending of light as it passes from one medium to another is called |
| A. | reflection |
| B. | diffraction |
| C. | refraction |
| D. | deflection |
| Answer» D. deflection | |
| 532. |
A boy 1.8 m tall is standing 2.8 m in front of a camera which is using a convex lens having a focal length of 0.04 m. The image distance should be |
| A. | 1.6 m |
| B. | 1 m |
| C. | 0.04 m |
| D. | 0.06 m |
| Answer» B. 1 m | |
| 533. |
The ratio of sin (x°) of the angle of incidence to sin (x°) of the angle of refraction is |
| A. | Gravitational law |
| B. | Reflection law |
| C. | refraction law |
| D. | Snell's law |
| Answer» E. | |
| 534. |
If a ray of light enters from air into glass, the angle of incidence formed is 30° and the refractive index of glass is 1.52, then the angle of refraction should be |
| A. | 19.3° |
| B. | 21° |
| C. | 25° |
| D. | 28.8° |
| Answer» B. 21° | |
| 535. |
If the focal length of a lens is expressed in meters then 1 Diopter is equal to |
| A. | 0.5 m-1 |
| B. | 2 m-1 |
| C. | 1 m-1 |
| D. | 0.25 m-1 |
| Answer» D. 0.25 m-1 | |
| 536. |
For a converging lens, the focal length is |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | constant |
| Answer» B. negative | |
| 537. |
The value of specific resistance depends upon |
| A. | length of wire |
| B. | area of cross section |
| C. | nature of conductor |
| D. | all of above |
| Answer» D. all of above | |
| 538. |
If 2 resistors of 5kΩ and 7kΩ are connected in series across a 15V battery, then equivalent resistance of the series combination should be |
| A. | 10kΩ |
| B. | 12kΩ |
| C. | 15kΩ |
| D. | 20kΩ |
| Answer» C. 15kΩ | |
| 539. |
In a circuit 3 resistors 2&Omega, 3&Omega, 6Ω are connected (in parallel combination)across a battery of 6V then, the current passing through each resistance should be |
| A. | 3A, 2A, 1A |
| B. | 4A, 5A, 2A |
| C. | 2A, 1A, 6A |
| D. | 5A, 2A, 3A |
| Answer» B. 4A, 5A, 2A | |
| 540. |
The current derived from a cell or a battery is |
| A. | no current |
| B. | alternative current |
| C. | negative current |
| D. | direct current |
| Answer» E. | |
| 541. |
The amount of heat and light energy converted per second by a bulb of 60 W is |
| A. | 50 J |
| B. | 60 J |
| C. | 120 J |
| D. | 80 J |
| Answer» C. 120 J | |
| 542. |
A short circuit occurs when a circuit is formed with |
| A. | high resistance |
| B. | high voltage |
| C. | low voltage |
| D. | low resistance |
| Answer» E. | |
| 543. |
A copper wire having the same size of steel wire have |
| A. | same resistance |
| B. | no resistance |
| C. | less resistance |
| D. | more resistance |
| Answer» E. | |
| 544. |
One microampere (µ A) is equal to |
| A. | 10-9A |
| B. | 10-6A |
| C. | 10-3A |
| D. | 10-6A |
| Answer» E. | |
| 545. |
The electrical energy supplied by charge Q in t seconds is |
| A. | V x I x t |
| B. | V x I |
| C. | I x t |
| D. | V x t |
| Answer» B. V x I | |
| 546. |
The reading on a voltmeter connected across a heating element is 80V. The amount of current passing measured by an ammeter is 4A. The resistance should be |
| A. | 10Ω |
| B. | 320Ω |
| C. | 50Ω |
| D. | 20Ω |
| Answer» E. | |
| 547. |
In metal wires, the movement of free electrons in a particular direction under the influence of an external field causes the |
| A. | flow of light |
| B. | flow of heat |
| C. | flow of current |
| D. | flow of signals |
| Answer» D. flow of signals | |
| 548. |
Current that changes direction after equal intervals of time is called |
| A. | direct current |
| B. | electric charge |
| C. | conventional current |
| D. | alternating current |
| Answer» E. | |
| 549. |
The amount of energy supplied by the current in unit time is known as |
| A. | electric power |
| B. | potential difference |
| C. | flow of light |
| D. | flow of heat |
| Answer» B. potential difference | |
| 550. |
The chemical energy of the battery changes to |
| A. | mechanical energy |
| B. | electrical potential energy |
| C. | atomic energy |
| D. | heat energy |
| Answer» C. atomic energy | |