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.
| 51. |
A monochromatic light beam is incident on a set of two polaroids, a polariser A and an analyser B. Then, the analyser B is adjusted and set to maximum transmitted intensity. In order to bloack the monochromatic light completely with the help of polaroids, the angle between their transmission axes should be: |
| A. | 135° |
| B. | 45° |
| C. | 90° |
| D. | 60° |
| Answer» D. 60° | |
| 52. |
In a standing wave for a pipe which is open at one end and closed at the other the fifth harmonic has? |
| A. | 3 nodes and 3 anti-nodes |
| B. | 5 nodes and 4 anti-nodes |
| C. | 4 nodes and 4 anti-nodes |
| D. | 5 nodes and 5 anti-nodes |
| Answer» B. 5 nodes and 4 anti-nodes | |
| 53. |
Light year is a measure of |
| A. | Time |
| B. | Distance |
| C. | Total amount of light falling on the earth in a year |
| D. | Average intensity of light falling on the earth in a year |
| Answer» C. Total amount of light falling on the earth in a year | |
| 54. |
An electromagnetic wave is represented by the electric field:\(\vec E = {{\rm{E}}_0}\hat n{\rm{sin}}\left[ {\omega t + \left( {6y - 8z} \right)} \right]\) Taking unit vectors in x, y and z directions to be \(\hat i,\;\hat j,\;{\rm{and}}\;\hat k\), the direction of propagation \(\;\hat s\), is: |
| A. | \(\hat s = \frac{{3\hat i - 4\hat j}}{5}\) |
| B. | \(\hat s = \frac{{ - 4\hat k + 3\hat j}}{5}\) |
| C. | \(\hat s = \left( {\frac{{ - 3\hat j + 4\hat k}}{5}} \right)\) |
| D. | \(\hat s = \frac{{4\hat j - 3\hat k}}{5}\) |
| Answer» D. \(\hat s = \frac{{4\hat j - 3\hat k}}{5}\) | |
| 55. |
For a non-relativistic, the ratio of phase velocity to group velocity of de Broglie wave is: |
| A. | 1 : 2 |
| B. | 2 : 3 |
| C. | 3 : 2 |
| D. | 2: 1 |
| Answer» B. 2 : 3 | |
| 56. |
A ray of light incident on a transparent block at an angle of incidence 60o. If μ of block is √3 then the angle of deviation of the refracted ray is: |
| A. | 30o |
| B. | 25o |
| C. | 15o |
| D. | 45o |
| Answer» B. 25o | |
| 57. |
A plane polarized electromagnetic wave is travelling in free space along + x direction. The amplitude of Its electric field is E0 = 240 N/C and its frequency is 150 MHz. The magnetic field of the wave can be written as: |
| A. | B = {(800 nT) sin [(3.14 rad/m) x + (9.42 × 108 rad/s)t]} k̂ |
| B. | B = {(800 nT) sin [(3.14 rad/m) x - (9.42 × 108 rad/s)t]} k̂ |
| C. | B = {(240 nT) sin [(2.09 rad/m) x - (6.27 × 108 rad/s)t]} k̂ |
| D. | B = {(240 nT) sin [(2.09 rad/m) x + (6.27 × 108 rad/s)t]} k̂ |
| Answer» C. B = {(240 nT) sin [(2.09 rad/m) x - (6.27 × 108 rad/s)t]} k̂ | |
| 58. |
An echo is heard due to the |
| A. | reflection of sound waves |
| B. | refraction of sound waves |
| C. | interference of sound waves |
| D. | resonance |
| Answer» B. refraction of sound waves | |
| 59. |
In a biprism experimental arrangement, an obtuse angle and two acute angles of the Fresnel's biprism respectively are nearly: |
| A. | 179°; 1° each |
| B. | 180°; 30' each |
| C. | 179°; 30' each |
| D. | 180°; 1° each |
| Answer» D. 180°; 1° each | |
| 60. |
If the speed of light in air is \(3 \times 10^8 m/s\) , then the speed of light in a medium of refractive index \(3/2 \) is |
| A. | \(2 \times 10^8 m/s\) |
| B. | \(9/4 \times 10^8 m/s\) |
| C. | \(3/4 \times 10^8 m/s\) |
| D. | \(3 \times 10^8 m/s\) |
| Answer» B. \(9/4 \times 10^8 m/s\) | |
| 61. |
Loudness of sound is measured in units of ____________. |
| A. | Decibel (dB) |
| B. | Metre (m) |
| C. | Hertz (Hz) |
| D. | Metre/second (m/s) |
| Answer» B. Metre (m) | |
| 62. |
Decibel is a unit to measure: |
| A. | Intensity of light |
| B. | Sound intensity |
| C. | Velocity of sound |
| D. | Solar radiation |
| Answer» C. Velocity of sound | |
| 63. |
Among the given options sound waves travel fastest through: |
| A. | water |
| B. | glycerin |
| C. | air |
| D. | steel |
| Answer» E. | |
| 64. |
On reflection from a rigid wall if an incident wave in a string is represented by "y(x, t) = A sin (kx – ωt)," then the amplitude of the stationary wave formed is ____________. |
| A. | A sin(kx) |
| B. | A/2 sin(kx) |
| C. | 2A sin(kx) |
| D. | 2A sin2(kx) |
| Answer» D. 2A sin2(kx) | |
| 65. |
A string 2.0 m long and fixed at its ends is driven by a 240 Hz vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is: |
| A. | 180 m/s, 80 Hz |
| B. | 320 m/s, 80 Hz |
| C. | 320 m/s, 120 Hz |
| D. | 180 m/s, 120 Hz |
| Answer» C. 320 m/s, 120 Hz | |
| 66. |
Light enters the eye through a thin membrane called |
| A. | retina |
| B. | cornea |
| C. | pupil |
| D. | iris |
| Answer» C. pupil | |
| 67. |
For a stationary wave if frequency is equal to ____________ then it is called second harmonic. (v is the speed of travelling waves on the string of length L) |
| A. | v/2L |
| B. | 2v/L |
| C. | v/L |
| D. | v/4L |
| Answer» D. v/4L | |
| 68. |
Figure shows charge (q) versus voltage (V) graph for series and parallel combination of two given capacitors. The capacitances are: |
| A. | 40 μF and 10 μF |
| B. | 60 μF and 40 μF |
| C. | 50 μF and 30 μF |
| D. | 20 μF and 30 μF |
| Answer» B. 60 μF and 40 μF | |
| 69. |
Interference bands will be obtained if |
| A. | Rays of light from different source are in contact |
| B. | two rays of same wavelength and out off phase by \(% MathType!MTEF!2!1!+- % feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 % qadaWcaaWdaeaapeGaaGymaaWdaeaapeGaaGOmaaaaaaa!37DC! \frac{1}{2}\)wavelength are in contact |
| C. | two rays of same wavelength and in phase are in contact |
| D. | two rays of different wavelength and in phase with one another |
| Answer» D. two rays of different wavelength and in phase with one another | |
| 70. |
A cinema Hall has volume of 7500 m3. It is required to have reverberation time of 1.61 seconds. The total absorption in the hall should be _______ (consider 0.161 as multiplication factor in the relevant formula) |
| A. | 7500 sabians |
| B. | 750 sabians |
| C. | 1980 W-m2 |
| D. | 995 OWU |
| Answer» C. 1980 W-m2 | |
| 71. |
Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become |
| A. | double |
| B. | half |
| C. | four times |
| D. | one fourth |
| Answer» B. half | |
| 72. |
Light is polarized to the maximum, when it is incident on a glass surface at an angle of incidence - |
| A. | 57° |
| B. | 67° |
| C. | 53° |
| D. | 37° |
| Answer» B. 67° | |
| 73. |
A spectrum line λ = 6000 Å of a star is found to be shifted 0.1 Å towards longer wavelengths from the position of the same line in terrestrial laboratory. Assuming the shift to be due to Doppler effect, what is the velocity of the star? |
| A. | 5 × 104 m/sec |
| B. | 5 × 103 m/sec |
| C. | 2.5 × 104 m/sec |
| D. | 2.5 × 103 m/sec |
| Answer» C. 2.5 × 104 m/sec | |
| 74. |
Bats detect the obstacles along the way by getting the reflected _____. |
| A. | Subsonic waves |
| B. | Radio waves |
| C. | Ultrasonic waves |
| D. | Electric magnetic waves |
| Answer» D. Electric magnetic waves | |
| 75. |
A source of sound S is moving with a velocity of 50 m/s towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the observer after crossing him? (Take velocity of wound in air is 350 m/s) |
| A. | 750 Hz |
| B. | 857 Hz |
| C. | 1143 Hz |
| D. | 807 Hz |
| Answer» B. 857 Hz | |
| 76. |
A plane electromagnetic wave travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time is E = 6 Vm-1 along y-direction. Its corresponding magnetic field component, B would be: |
| A. | 2 × 10-8 T along z-direction |
| B. | 6 × 10-8 T along x-direction |
| C. | 6 × 10-8 T along z-direction |
| D. | 2 × 10-8 T along y-direction |
| Answer» B. 6 × 10-8 T along x-direction | |
| 77. |
Electric intensity at any point in an electric field is equal to the ___________ at that point. |
| A. | electric flux |
| B. | magnetic flux density |
| C. | potential gradient |
| D. | none of them |
| Answer» D. none of them | |
| 78. |
A running race is organized between ultrasonics, audible and infrasonic waves in a medium, then the winner is: |
| A. | Infasonics |
| B. | Ultrasonics |
| C. | Audible |
| D. | All have same speed and there is no winner or loser. |
| Answer» E. | |
| 79. |
A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a sonar signal of 500 Hz to detect A and receives a reflected sound of frequency ν. The value of ν is close to:(Speed of sound in water = 1500 m/s) |
| A. | 504 Hz |
| B. | 507 Hz |
| C. | 499 Hz |
| D. | 502 Hz |
| Answer» E. | |
| 80. |
A 100 V carrier wave is made to vary between 160 V and 40 V by a modulating signal. What is the modulation index? |
| A. | 0.4 |
| B. | 0.5 |
| C. | 0.6 |
| D. | 0.3 |
| Answer» D. 0.3 | |
| 81. |
An electromagnetic wave of intensity 50 Wm-2 enters in a medium of refractive index ‘n’ without any loss. The ratio of the magnitudes of electric fields and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively, given by |
| A. | \(\left( {\frac{1}{{\sqrt n }},\;\sqrt n } \right)\) |
| B. | \(\left( {\sqrt n ,\sqrt n } \right)\) |
| C. | \(\left( {\frac{1}{{\sqrt n }},{\rm{\;}}\frac{1}{{\sqrt n }}} \right)\) |
| D. | \(\left( {\sqrt n ,{\rm{\;}}\frac{1}{{\sqrt n }}} \right)\) |
| Answer» E. | |
| 82. |
Light waves |
| A. | can travel in perfect vacuum |
| B. | require air to travel through |
| C. | require an electric field to travel through |
| D. | require a magnetic field to travel through |
| Answer» B. require air to travel through | |
| 83. |
An interference fringe pattern is obtained in Fresnel's biprism, using sodium light of a mean wavelength of 589.3 nm. On introducing a thin sheet of a transparent material, having a thickness of 1.1 μm in the path of one of the interfering beams, the central bright fringe is found to shift through a distance equal to the spacing between the successive bright fringes. Then, the refractive index of the material of the transparent sheet is near: |
| A. | 1.6 |
| B. | 1.62 |
| C. | 1.5 |
| D. | 1.54 |
| Answer» E. | |
| 84. |
A tube of length 20 cm containing sugar solution rotates the plane of polarization by 110. If the specific rotation of sugar is 660, the strength of the sugar solution is: |
| A. | 0.0667 g/cc |
| B. | 0.0833 g/cc |
| C. | 0.0400 g/cc |
| D. | 0.0886 g/cc |
| Answer» C. 0.0400 g/cc | |
| 85. |
In which medium, sound travels fastest? |
| A. | Solid |
| B. | Liquid |
| C. | Gas |
| D. | Vacuum |
| Answer» B. Liquid | |
| 86. |
In an electromagnetic wave, the electric and magnetic fields are |
| A. | Always in phase |
| B. | Always in antiphase |
| C. | Always at 90 degree phase difference |
| D. | Always at 45 degree phase difference |
| Answer» B. Always in antiphase | |
| 87. |
A bird in air is at a height 'y' from the surface of water. A fish is at a depth 'x' below the surface of water. The apparent distance of fish from the bird is (The refractive index of water is μ) |
| A. | \(x + \frac y \mu\) |
| B. | μx + y |
| C. | \(\frac x \mu - y\) |
| D. | \(\frac x \mu + y\) |
| Answer» E. | |
| 88. |
In a Fresnel's biprism arrangement, monochromatic light of wavelength 550 nm is used to obtain interference fringe pattern on the screen. When a thin, transparent glass sheet of refractive index 1.52 is introduced in the path of one of the interfering beams, ten interference fringes are found to be shifted. Then, the thickness of the glass sheet is nearly: |
| A. | 2.4 μm |
| B. | 24.6 μm |
| C. | 10.6 μm |
| D. | 6.4 μm |
| Answer» D. 6.4 μm | |
| 89. |
In which frequency band does a 2GHz single lie? |
| A. | VHF |
| B. | HF |
| C. | UHF |
| D. | EHF |
| Answer» D. EHF | |
| 90. |
One decibel is equal to |
| A. | \(\dfrac{1}{10} \rm bel\) |
| B. | 10 bel |
| C. | \(\dfrac{9}{10} \rm bel\) |
| D. | \(\dfrac{1}{9} \rm bel\) |
| Answer» B. 10 bel | |
| 91. |
Match the Type of wave with its Method of production. Type of Wave Method of ProductionA.Gamma rays1.Klystron valveB.Infra-red2.Radioactive decay of the nucleusC. Microwave 3.Vibration of atoms and molecules |
| A. | A-3, B-2, C-1 |
| B. | A-1, B-2, C-3 |
| C. | A-2, B-1, C-3 |
| D. | A-2, B-3, C-1 |
| Answer» E. | |
| 92. |
Bragg's reflection by crystal in an X-ray beam CANNOT occur for a wavelength, if: |
| A. | λ > 2d |
| B. | λ > d |
| C. | λ < d |
| D. | λ < 2d |
| Answer» B. λ > d | |
| 93. |
Identify the statements among the following which are true:(p) The velocity of sound increases with altitude.(q) The velocity of sound increases during a shower.(r) The velocity of sound in air at a particular place does not remain the same during day and night. |
| A. | Only (q) |
| B. | (q) & (r) |
| C. | (p) & (r) |
| D. | Only (p) |
| Answer» C. (p) & (r) | |
| 94. |
A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, \(\vec E = 6.3\hat j{\rm{\;V}}/{\rm{m}}\). The corresponding magnetic field \(\vec B{\rm{\;}}\), at that point will be: |
| A. | \(18.9 \times {10^{ - 8}}\hat k{\rm{\;T}}\) |
| B. | \(2.1 \times {10^{ - 8}}\hat k{\rm{\;T}}\) |
| C. | \(6.3 \times {10^{ - 8}}\hat k{\rm{\;T}}\) |
| D. | \(18.9 \times {10^8}\hat k{\rm{\;T}}\) |
| Answer» C. \(6.3 \times {10^{ - 8}}\hat k{\rm{\;T}}\) | |
| 95. |
'Beats' is a phenomenon that occurs when frequencies of two harmonic waves are |
| A. | equal |
| B. | far apart |
| C. | multiples of each other |
| D. | nearly same |
| Answer» E. | |
| 96. |
Mechanical waves are governed by ___________ Laws. |
| A. | Newton's |
| B. | Faraday's |
| C. | Hertz' |
| D. | Planck's |
| Answer» B. Faraday's | |
| 97. |
Light rays from an object fall on a surface and get reflected in a completely diffused manner. What can you say about the nature of image of the object? |
| A. | It will be virtual and enlarged |
| B. | No image will be formed |
| C. | It will be virtual and of same size |
| D. | It will be real and enlarged |
| Answer» C. It will be virtual and of same size | |
| 98. |
A stone is dropped in a well and splash is heard after 1.5 seconds after the stone hits the surface. If the velocity of sound is 327 m/s, the depth of well is |
| A. | 218 m |
| B. | 227 m |
| C. | 490.5 m |
| D. | None of these |
| Answer» D. None of these | |
| 99. |
Bats detect obstacles in their path by receiving the reflected |
| A. | Infrared waves |
| B. | Ultrasonic waves |
| C. | Radio waves |
| D. | Microwaves |
| Answer» C. Radio waves | |
| 100. |
A tuning fork, vibrating with a frequency of 90 Hz, is moving towards an observer with a with a speed of 0.1 times the speed of sound. The frequency of the note heard by the observer would be: |
| A. | 80 Hz |
| B. | 90 Hz |
| C. | 100 Hz |
| D. | 120 Hz |
| Answer» D. 120 Hz | |