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.
| 101. |
A ray of light is incident on a transparent medium at an angle of 60°. The reflected ray of light is found to be completely polarised. Then, the refractive index of the transparent medium is nearly: |
| A. | 1.73 |
| B. | 1.62 |
| C. | 1.52 |
| D. | 1.33 |
| Answer» B. 1.62 | |
| 102. |
____________ waves associated with electrons are employed in electron microscopes. |
| A. | Mechanical |
| B. | Matter |
| C. | Electromagnetic |
| D. | Harmonic |
| Answer» C. Electromagnetic | |
| 103. |
A boy stands 83 m in front of a high wall and then blows a whistle, calculate the time interval when he hears an echo. Speed of sound is 332 m/s. |
| A. | 2.0 s |
| B. | 0.5 s |
| C. | 1.0 s |
| D. | 2.5 s |
| Answer» C. 1.0 s | |
| 104. |
.______ technology is used in TV remotes. |
| A. | LCD |
| B. | Infrared lights |
| C. | Ultraviolet rays |
| D. | Ultraviolet rays and LCD |
| Answer» C. Ultraviolet rays | |
| 105. |
In an ultrasonic pulse echo technique, the ultrasonic pulse travels with velocity 5.941 km/s in a steel bar of thickness 22 mm. Then, the echo time of the ultrasonic pulse is nearly: |
| A. | 5.4 μs |
| B. | 6.4 μs |
| C. | 7.4 μs |
| D. | 8.4 μs |
| Answer» D. 8.4 μs | |
| 106. |
In the 19th century, Western music became popular in India and as a result the following instruments were adopted: |
| A. | Guitar, Tabla |
| B. | Trampoline, Tanpura |
| C. | Violin, Piano |
| D. | Sitar, Piano |
| Answer» D. Sitar, Piano | |
| 107. |
At 20°C, the speed of sound in water is approximately |
| A. | 330 m/s |
| B. | 800 m/s |
| C. | 1500 m/s |
| D. | 5000 m/s |
| Answer» D. 5000 m/s | |
| 108. |
An object is 10.64 km below the sea level. A research team sends down a sonar signal to confirm this depth. After how long can it expect to get the echo? Take speed of sound in sea water = 1520 m/s. |
| A. | 21 s |
| B. | 7 s |
| C. | 14 s |
| D. | 3.5 s |
| Answer» D. 3.5 s | |
| 109. |
In a closed organ pipe _________ is formed at the closed end and _________ is formed at the open end |
| A. | node, antinode |
| B. | antinode, node |
| C. | vibration, oscillation |
| D. | oscillation, vibration |
| Answer» B. antinode, node | |
| 110. |
A long 1 metre thick dielectric (ϵ = 3 ϵ0) slab occupying the region 0 < x < 5 is placed perpendicularly in a uniform electric field \({\bar E_0} = 6{\bar a_X}\). The polarization \({\bar P_i} \) inside the dielectric is |
| A. | 4ϵ0\({\bar a_X}\) |
| B. | 8ϵ0\({\bar a_X}\) |
| C. | 36ϵ0\({\bar a_X}\) |
| D. | Zero |
| Answer» B. 8ϵ0\({\bar a_X}\) | |
| 111. |
A tuning fork vibrates with 2 vibrations in 0.4 seconds. Its frequency is |
| A. | 5 |
| B. | 6 |
| C. | 8 |
| D. | 2.5 |
| Answer» B. 6 | |
| 112. |
A train is approaching a station with a uniform velocity of 72 kmph and the frequency of the whistle of that train is 480 Hz. The apparent increase in the frequency of that whistle heard by a stationary observer on the platform is (Velocity of sound in air is 340 m/s). |
| A. | 45 Hz |
| B. | 15 Hz |
| C. | 60 Hz |
| D. | 30 Hz |
| Answer» E. | |
| 113. |
In a Fresnel's biprism setup, monochromatic light of wavelength 550 nm is used to obtain interference fringes on the screen. On introducing a thin sheet of transparent material of thickness 1.1 microns in the path of one of the interfering beams, the central fringe is shifted through distance equal to the spacing between successive bright fringes. Then, the refractive index of the transparent material is |
| A. | 1.7 |
| B. | 1.5 |
| C. | 1.4 |
| D. | 1.6 |
| Answer» C. 1.4 | |
| 114. |
A sugar solution in a tube of length 2.0 dm produces optical rotation of 12°. Then, the sugar solution to one half of its initial concentration. If the dilute solute solution is contained in another tube of length 3.0 dm, the optical rotation produced by it will be: |
| A. | 9° |
| B. | 7° |
| C. | 10° |
| D. | 11° |
| Answer» B. 7° | |
| 115. |
Colour vision in human eyes is the function of photoreceptor cells named |
| A. | Rods |
| B. | Cones |
| C. | Blind spot |
| D. | Fovea |
| Answer» C. Blind spot | |
| 116. |
Compared to audible sound waves, ultrasound waves have |
| A. | higher speed. |
| B. | higher frequency. |
| C. | longer wavelength. |
| D. | both higher speed and frequency. |
| Answer» E. | |
| 117. |
In Fleming’s left hand rule thumb always represents direction of |
| A. | current flow |
| B. | induced emf |
| C. | magnetic field |
| D. | force |
| Answer» E. | |
| 118. |
Near and far points of healthy human eye respectively are: |
| A. | 25 cm and 100 cm |
| B. | 25 cm and infinity |
| C. | 0 and infinity |
| D. | 0 and 25 cm |
| Answer» C. 0 and infinity | |
| 119. |
A far sighted person can read a book kept at usual distance by looking through a pin hole, because while looking through the pin hole: |
| A. | The focal length of eye lens is decreased. |
| B. | The focal length of eye lens is increased. |
| C. | It acts like convex lens. |
| D. | It acts like concave lens. |
| Answer» B. The focal length of eye lens is increased. | |
| 120. |
If the incident wave be represented by y(x,t) = a sin (kx – ωt), then, for reflection at a rigid boundary the reflected wave is represented by? |
| A. | y(x,t) = a sin (kx + ωt) |
| B. | y(x,t) = -a sin(kx + ωt) |
| C. | y(x,t) = -a sin(kx + ωt + π/2) |
| D. | y(x,t) = a sin (kx + ωt - π/2) |
| Answer» C. y(x,t) = -a sin(kx + ωt + π/2) | |
| 121. |
In a stationary wave in a stretched string fixed at both ends the first anti-node is formed at x = __________. ('λ' is the wavelength of the stationary wave) |
| A. | λ/4 |
| B. | λ/2 |
| C. | λ |
| D. | 2 λ |
| Answer» B. λ/2 | |
| 122. |
On reflection from an open boundary, a travelling wave in a string undergoes a phase change of ________ radians. |
| A. | π |
| B. | 2π |
| C. | π/2 |
| D. | 0 |
| Answer» E. | |
| 123. |
If the frequency of a sound wave is 50 Hz, then what is its time period? |
| A. | 0.02 s |
| B. | 0.2 s |
| C. | 0.05 s |
| D. | 0.5 s |
| Answer» B. 0.2 s | |
| 124. |
A uniform rope of length 10 m and mass 15 kg hangs vertically from a rigid support. A block of mass 5 kg is attached to the free end of the rope. If a transverse pulse of wavelength 0.04 m is produced at the lower end of the rope, the wavelength of the pulse when it reaches the top of the rope will be |
| A. | 0.02 m |
| B. | 0.04 m |
| C. | 0.08 m |
| D. | 0.16 m |
| Answer» D. 0.16 m | |
| 125. |
A train approaches a stationary observer, with a velocity of \(\dfrac{1}{20}\) of velocity of sound. A sharp blast is blown with the whistle of the engine at equal intervals of one second. the interval between the successive blasts as heard by the observer is |
| A. | \(\dfrac{1}{20}s\) |
| B. | \(\dfrac{1}{10}s\) |
| C. | \(\dfrac{19}{20}s\) |
| D. | \(\dfrac{20}{19}s\) |
| Answer» D. \(\dfrac{20}{19}s\) | |
| 126. |
At some location on earth, the horizontal component of earth's magnetic field is 18 × 10-6 T. At this location, magnetic needle of length 0.12 m and pole strength 1.8 A-m is suspended from its mid-point using a thread, it makes 45° angle with horizontal in equilibrium. To keep this needle horizontal, the vertical force that should be applied at one of its ends is |
| A. | 6.5 × 10-5 N |
| B. | 3.6 × 10-5 N |
| C. | 1.3 × 10-5 N |
| D. | 1.8 × 10-5 N |
| Answer» B. 3.6 × 10-5 N | |
| 127. |
Interference effects are possible due to superposition of two or more waves in a certain region of space in case of: |
| A. | Both transverse and longitudinal waves |
| B. | longitudinal waves only |
| C. | transverse waves only |
| D. | neither transverse waves nor a combination of transverse and longitudinal waves |
| Answer» B. longitudinal waves only | |
| 128. |
According to the Central Pollution Control Board (CPCB), what is the upper limit of sound for residential area? |
| A. | 45 Decibels |
| B. | 55 Decibels |
| C. | 75 Decibels |
| D. | 90 Decibels |
| Answer» C. 75 Decibels | |
| 129. |
An earthquake generates both transverse (S) and longitudinal (P) waves in earth. The speed of S waves is about 4.5 kms-1 and that of P wave 8.0 kms-1. A seismograph records P and S waves from an earthquake. The first P wave arrives 4.0 min before the first S wave. The epicentre is located at a distance of about: |
| A. | 25 km |
| B. | 250 km |
| C. | 2500 km |
| D. | 25000 km |
| Answer» D. 25000 km | |
| 130. |
________ is a unit used in radio astronomy to measure the strength (flux density) of radio signals from space |
| A. | Amp |
| B. | Jansky |
| C. | Hertz |
| D. | Knot |
| Answer» C. Hertz | |
| 131. |
Frequency range of Ka-band EM waves is |
| A. | 18.0 GHz – 26.5 GHz |
| B. | 26.5 GHz – 40.0 GHz |
| C. | 12.0 GHz – 18.0 GHz |
| D. | 40.0 GHz – 60.0 GHz |
| Answer» C. 12.0 GHz – 18.0 GHz | |
| 132. |
A wire of length 2 L, is made by joining two wires A and B of same length but different radii r and 2r and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is p and that in B is q then the ratio p : q is: |
| A. | 3 : 5 |
| B. | 4 : 9 |
| C. | 1 : 2 |
| D. | 1 : 4 |
| Answer» D. 1 : 4 | |
| 133. |
Interference proves |
| A. | Transverse nature of a wave |
| B. | Longitudinal nature of wave |
| C. | Wave nature |
| D. | Particle nature |
| Answer» D. Particle nature | |
| 134. |
How many internal reflections of light take place in the formation of primary rainbow? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | More than 2 |
| Answer» C. 2 | |
| 135. |
Interference event is observed |
| A. | Only in transverse waves |
| B. | Only in longitudinal waves |
| C. | In both types of waves |
| D. | None |
| Answer» D. None | |
| 136. |
In an electromagnetic wave, Poynting vector representing the flow of electromagnetic energy per unit area per unit time across the boundary is represented by |
| A. | E/H |
| B. | E/B |
| C. | E × B |
| D. | E × H |
| Answer» E. | |
| 137. |
Match the Type of wave with its wavelengthType of WaveWavelengthA. Light visible by humans1. 1 mm to 700 nmB. X-Rays2. 700 nm to 400 nmC. Infrared3. 1 nm to 10-3 nm |
| A. | A-3, B-2, C-1 |
| B. | A-2, B-3, C-1 |
| C. | A-1, B-2, C-3 |
| D. | A-2, B-1, C-3 |
| Answer» C. A-1, B-2, C-3 | |
| 138. |
A plane electromagnetic wave having a frequency ‘ν’ = 23.9 GHz propagates along the positive z-direction in free space. The peak value of the Electric Field is 60 V/m. Which among the following is the acceptable magnetic field component in the electromagnetic wave? |
| A. | \(\vec B\) = 2 × 107 sin(0.5 × 103 z + 1.5 × 1011t) î |
| B. | \(\vec B \) = 2 × 10-7 sin(0.5 × 103 z - 1.5 × 1011t) î |
| C. | \(\vec B \) = 60 sin(0.5 × 103 x + 1.5 × 1011t) k̂ |
| D. | \(\vec B \) = 2 × 10-7 sin(1.5 × 102 x + 0.5 × 1011t) ĵ |
| Answer» C. \(\vec B \) = 60 sin(0.5 × 103 x + 1.5 × 1011t) k̂ | |
| 139. |
A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m (m << M). When the car is at rest, the speed of transverse waves in the string is 60 ms-1. When the car has acceleration a, the wave-speed increases to 60.5 ms-1. The value of a, in terms of gravitational acceleration g, is closest to: |
| A. | \(\frac{g}{{30}}\) |
| B. | \(\frac{g}{5}\) |
| C. | \(\frac{g}{{10}}\) |
| D. | \(\frac{g}{{20}}\) |
| Answer» C. \(\frac{g}{{10}}\) | |
| 140. |
For human ear, the range of audible frequency is: |
| A. | 2000 Hz to 10000 Hz |
| B. | 20 Hz to 200 Hz |
| C. | 20 Hz to 20000 Hz |
| D. | 20 Hz to 10000 Hz |
| Answer» D. 20 Hz to 10000 Hz | |
| 141. |
If 1,2 and 3 represent different mediums and 'n' is refractive index, then which of the following equations is true? |
| A. | n23 = n31 × n12 |
| B. | n32 = n31 × n12 |
| C. | n32 = n13 × n12 |
| D. | n23 = n13 × n12 |
| Answer» C. n32 = n13 × n12 | |
| 142. |
A man is standing between two parallel cliffs and fires a gun and he hears first and second echos after 1.5 seconds and 3.5 seconds, respectively. If velocity of sound in air is 340 m/s, then distance between the cliffs is |
| A. | 1190 m |
| B. | 510 m |
| C. | 395 m |
| D. | 850 m |
| Answer» E. | |
| 143. |
For a stationary wave, if frequency is equal to ____________ then it is called fundamental mode. ('v' is the speed of travelling waves on the string oflength 'L') |
| A. | v/L |
| B. | 2v/L |
| C. | v/4L |
| D. | v/(2L) |
| Answer» E. | |
| 144. |
Echo of sound is more prominent if surface is |
| A. | soft |
| B. | rigid |
| C. | porous |
| D. | smooth |
| Answer» C. porous | |