MCQOPTIONS
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MCQOPTIONS
This section includes 144 Mcqs, each offering curated multiple-choice questions to sharpen your BITSAT knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In which medium sound travels faster? |
| A. | Solid |
| B. | Liquid |
| C. | Gas |
| D. | Water vapour |
| Answer» B. Liquid | |
| 2. |
Which of the following is also known as pressure waves? |
| A. | Transverse waves |
| B. | Longitudinal waves |
| C. | Mechanical waves |
| D. | Stationary waves |
| Answer» C. Mechanical waves | |
| 3. |
What is the most fundamental property of wave? |
| A. | Temperature |
| B. | Pressure |
| C. | Frequency |
| D. | Wavelength |
| Answer» D. Wavelength | |
| 4. |
A wave transmits momentum. Can’t it transfer angular momentum? |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 5. |
What kind of wave is formed in organ pipes? |
| A. | Transverse stationary waves |
| B. | Electromagnetic waves |
| C. | Mechanical waves |
| D. | Longitudinal stationary waves |
| Answer» E. | |
| 6. |
Sound travels through a gas under which of the following condition? |
| A. | Isothermal condition |
| B. | Non-isothermal condition |
| C. | Adiabatic condition |
| D. | Transverse condition |
| Answer» D. Transverse condition | |
| 7. |
For an aluminium the modulus of rigidity is 2.1×1010 N/m2 and density is 2.7×103 kg/m3. Find the speed of transverse waves in the medium. |
| A. | 27.9×103 m/s |
| B. | 2.79×103 m/s |
| C. | 25.14×103 m/s |
| D. | 24.1×103 m/s |
| Answer» C. 25.14×103 m/s | |
| 8. |
Which of the following waves can be transmitted through solids, liquids and gases? |
| A. | Transverse waves |
| B. | Electromagnetic waves |
| C. | Mechanical waves |
| D. | Longitudinal waves |
| Answer» E. | |
| 9. |
Transverse waves can be formed in fluids. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
What are the essential properties a medium must possess for the propagation of mechanical waves? |
| A. | Stable pressure |
| B. | Maximum friction |
| C. | Constant temperature |
| D. | Minimum friction |
| Answer» E. | |
| 11. |
Mechanical waves are called elastic waves. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
When a pebble is dropped into a pond of still water, what happens? |
| A. | Particles move |
| B. | Waves move |
| C. | The pebble moves |
| D. | Water moves |
| Answer» C. The pebble moves | |
| 13. |
At room temperature, the speed of sound in air is 340 m/s. An organ pipe with both ends open has a length L = 29 cm. An extra hole is created at the position L/2. The lowest frequency of sound produced is |
| A. | 293 Hz |
| B. | 586 Hz |
| C. | 1172 Hz |
| D. | 2344 Hz |
| Answer» D. 2344 Hz | |
| 14. |
A man claps his hands in front of a wall and he hears an echo after 1.6s. He walks. 33m towards wall and hears the echo 1.4 s after clapping. Then velocity of sound in air is: |
| A. | 320 m/s |
| B. | 350 m/s |
| C. | 330 m/s |
| D. | 340 m/s |
| Answer» D. 340 m/s | |
| 15. |
All of the following can propagate through vacuum except |
| A. | X rays |
| B. | radio waves |
| C. | light waves |
| D. | sound waves |
| Answer» E. | |
| 16. |
A resonant system has a fundamental frequency of 140 Hz. If the next frequencies that are able to give resonance are 280 Hz and 420 Hz the system could be |
| A. | An organ pipe closed at both ends |
| B. | An organ pipe open at both ends |
| C. | An organ pipe closed at one end and open at the other end |
| D. | A taut string vibrating between two fixed points |
| Answer» C. An organ pipe closed at one end and open at the other end | |
| 17. |
An echo is heard after 0.6 s when a boy fires a cracker, 99 m away from a tall building then the speed of sound is |
| A. | 165 m / s |
| B. | 330 m / s |
| C. | 340 m / s |
| D. | 350 m / s |
| Answer» C. 340 m / s | |
| 18. |
A string of length 1 m mass 5 g is fixed at both ends. The tension in the string is 8.0 N. The string is set into vibration using an external vibrator of frequency 100 Hz. The separation between successive nodes on the string is close to |
| A. | 16.6 cm |
| B. | 33.3 cm |
| C. | 10.0 cm |
| D. | 20.0 cm |
| Answer» E. | |
| 19. |
Light can be polarized by |
| A. | Reflection |
| B. | Refraction |
| C. | Scattering |
| D. | All the above |
| Answer» E. | |
| 20. |
A point source of light, S is placed at a distance L in front of the centre of plane distance L in front of the centre of plane vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is |
| A. | \(\frac{{\rm{d}}}{2}\) |
| B. | d |
| C. | 3d |
| D. | 2d |
| Answer» D. 2d | |
| 21. |
How many times the logarithm of the ratio of sound pressure in air to the reference sound pressure is the sound pressure level in decibels? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» C. 30 | |
| 22. |
A long sighted person has a least distance of distinct vision of 50 cm. He wants to reduce to 25 cm. He should use a |
| A. | concave lens of focal length 25 cm |
| B. | convex lens of focal length 50 cm |
| C. | concave lens of focal length 50 cm |
| D. | convex lens of focal length 25 cm |
| Answer» C. concave lens of focal length 50 cm | |
| 23. |
On gradually decreasing the distance between the slits in Fresnel's biprism experimental arrangement, the fringe width in the interference pattern obtained using the monochromatic light source: |
| A. | first increases and then decreases |
| B. | decreases |
| C. | increases |
| D. | remains the same |
| Answer» D. remains the same | |
| 24. |
Echocardiogram is more closely related toA. Doppler effectB. Zeeman effectC. Photoelectric effectD. Magnetic effect |
| A. | D |
| B. | B |
| C. | C |
| D. | A |
| Answer» E. | |
| 25. |
An automobile travels 72 km/hr towards a high wall. The driver sounds a horn of frequency 124 cycle/sec. What is the frequency of the reflected sound heard by the driver? (Velocity of sound = 330 m/sec) |
| A. | 124 cycles /sec |
| B. | 132 cycles/sec |
| C. | 140 cycles /sec |
| D. | 148 cycles/sec |
| Answer» D. 148 cycles/sec | |
| 26. |
Hertz is the SI unit of ________. |
| A. | Energy |
| B. | Pressure |
| C. | Frequency |
| D. | Force |
| Answer» D. Force | |
| 27. |
A light wave is incident normally on a glass slab of refractive index 1.5. If 4% of light gets reflected and the amplitude of the electric field of the incident light is 30 V/m, then the amplitude of the electric field for the wave propagating in the glass medium will be |
| A. | 30 V/m |
| B. | 6 V/m |
| C. | 10 V/m |
| D. | 24 V/m |
| Answer» E. | |
| 28. |
In a standing wave in a pipe open at both ends the second harmonic has__________. |
| A. | 3 nodes and 2 anti-nodes |
| B. | 2 nodes and 3 anti-nodes |
| C. | 2 nodes and 2 anti-nodes |
| D. | 3 nodes and 3 anti-nodes |
| Answer» C. 2 nodes and 2 anti-nodes | |
| 29. |
If the intensity of the rustle of the leaves is 10-11 Wm-2, what will be the level of intensity due to that rustle? |
| A. | 8 dB |
| B. | 10 dB |
| C. | 5 dB |
| D. | 12 dB |
| Answer» C. 5 dB | |
| 30. |
Consider the following statements about visible light, UV light and X-rays:1. The wavelength of visible light is more than that of X-rays.2. The energy of X-ray photons is higher than that of UV light photons.3. The energy of UV light photons is less than that of visible light photons.Which of the statements given above is/are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 only |
| Answer» C. 2 and 3 only | |
| 31. |
If the resistivity of a material is decreased by a factor of 4, the skin depth of an electromagnetic wave incident on it |
| A. | Decreases by a factor of 2 |
| B. | Decreases by a factor of 4 |
| C. | Increases by a factor of 4 |
| D. | Increases by a factor of 2 |
| Answer» B. Decreases by a factor of 4 | |
| 32. |
If f (t) = A sin ωt + B cos ωt is written as f (t) = D sin (ωt + φ ) then 'φ' is equal to? |
| A. | tan-1(A/B) |
| B. | √(A2 + B2) |
| C. | tan-1(B/A) |
| D. | A + B |
| Answer» D. A + B | |
| 33. |
A plane-polarized electromagnetic wave is travelling in free space along + x-direction. The amplitude of its electric field is Eo = 240 N/C and its frequency is 150 MHz. The electric field of the wave can be written as: |
| A. | E = {(240 N/C) sin [(2.09 rad/m) x + (6.27 × 108 rad/s) t]} j |
| B. | E = {(240 N/C) sin [(3.14 rad/m) x – (9.42 × 108 rad/s) t]} j |
| C. | E = {(240 N/C) sin [(2.09 rad/m) x - (6.27 × 108 rad/s) t]} j |
| D. | E = {(240 N/C) sin [(3.14 rad/m) x + (9.42 × 108 rad/s) t]} j |
| Answer» C. E = {(240 N/C) sin [(2.09 rad/m) x - (6.27 × 108 rad/s) t]} j | |
| 34. |
Echo is heard because of _________. |
| A. | reflection of light wave |
| B. | refraction of Light wave |
| C. | reflection of sound wave |
| D. | refraction of sound wave |
| Answer» D. refraction of sound wave | |
| 35. |
Musical instruments having same loudness and pitch can be distinguished by: |
| A. | Amplitude of sound |
| B. | Quality or timbre |
| C. | Frequency of sound |
| D. | Intensity of sound |
| Answer» C. Frequency of sound | |
| 36. |
Brilliant colors observed on thin films of oily surface and soapy water arise due to the optical phenomenon of ___________. |
| A. | dispersion |
| B. | diffraction |
| C. | interference |
| D. | scattering |
| Answer» D. scattering | |
| 37. |
A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by [Take, permittivity of space, εo = 9 × 10-12 SI units and speed of light, c = 3 × 108 m/s] |
| A. | 1 kV/m |
| B. | 0.7 kV/m |
| C. | 2 kV/m |
| D. | 1.4 kV/m |
| Answer» E. | |
| 38. |
On reflection from a rigid wall a wave in a string undergoes a phase change of ________ radians. |
| A. | 2π |
| B. | π/2 |
| C. | 0 |
| D. | π |
| Answer» E. | |
| 39. |
In case of formation of multiple images by way of multiple reflection and refraction in the thick glass slab which image is the brightest? |
| A. | First |
| B. | Third |
| C. | Fourth |
| D. | Second |
| Answer» E. | |
| 40. |
______ cannot be corrected with spectacles. |
| A. | Presbyopia |
| B. | Hypermetropia |
| C. | Cataract |
| D. | Myopia |
| Answer» D. Myopia | |
| 41. |
In a standing wave, in a pipe open at both ends, the first harmonic has? |
| A. | 2 nodes and 1 anti-node |
| B. | 1 node and 1 anti-node |
| C. | 1 node and 2 anti-nodes |
| D. | 2 nodes and 2 anti-node |
| Answer» D. 2 nodes and 2 anti-node | |
| 42. |
Mirage Effect is caused due to |
| A. | Reflection of Light |
| B. | Refraction of Light |
| C. | Scattering and reflection of Light |
| D. | Reflection and Refraction Light |
| Answer» E. | |
| 43. |
If the magnetic susceptibility of a specimen is small and positive, the specimen is |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Non-magnetic |
| Answer» C. Ferromagnetic | |
| 44. |
At what temperature is the velocity of sound in air is twice its velocity at 30°C? |
| A. | 1212°C |
| B. | 120°C |
| C. | 60°C |
| D. | 939°C |
| Answer» E. | |
| 45. |
How many nodes and anti-nodes the third harmonic of a standing wave in a pipe which is open at one end and closed at the other has? |
| A. | 3 nodes and 2 anti-nodes |
| B. | 2 nodes and 2 anti-nodes |
| C. | 3 nodes and 3 anti-nodes |
| D. | 4 nodes and 4 anti-nodes |
| Answer» C. 3 nodes and 3 anti-nodes | |
| 46. |
If \(\dfrac{4}{3}\) and \(\dfrac{3}{2}\) be respectively the absolute refractive indices of water and glass, then the refractive index of glass relative to water is |
| A. | \(\dfrac{8}{9}\) |
| B. | \(\dfrac{9}{8}\) |
| C. | \(\dfrac{4}{3}\) |
| D. | \(\dfrac{3}{4}\) |
| Answer» C. \(\dfrac{4}{3}\) | |
| 47. |
A person standing on the bank of a river observes a fish inside the water. He sees the fish_____. |
| A. | At the same depth but on the right hand side of the original position |
| B. | At its original position |
| C. | Just above the original position |
| D. | Just below the original position |
| Answer» D. Just below the original position | |
| 48. |
A broadcasting station transmits waves with a frequency of 71 × 104 Hz and a speed of 3×108 m/s. The wavelength of the wave is: |
| A. | 418.8 m |
| B. | 208.4 m |
| C. | 422.5 m |
| D. | 324.6 m |
| Answer» D. 324.6 m | |
| 49. |
Point of maximum positive displacement in a transverse wave is called? |
| A. | trough |
| B. | vertex |
| C. | apex |
| D. | crest |
| Answer» E. | |
| 50. |
A person wears glasses of power -2.5D. Tell whether the person is long-sighted or near-sighted and find the far point of the person without glasses |
| A. | near-sighted, -20 cm |
| B. | long-sighted, -20 cm |
| C. | near-sighted, -40 cm |
| D. | long-sighted, -40 cm |
| Answer» D. long-sighted, -40 cm | |