11th Physics Book Back One Mark Question Bank EM 2022-23 PDF

https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 10 84. The work done by the Sun’s gravitational force...

https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 10 84. The work done by the Sun’s gravitational force on the Earth is (a) always zero (b) always positive (c) can be positive or negative (d) always negative 85. If the mass and radius of the Earth are both doubled, then the acceleration due to gravity g ′ g (a) remain s same (b) (c) 2g (d) 4g 2 86. The magnitude of the Sun’s gravitational field as experienced by Earth is (a) same over the year (b) decreases in the month of January and increases in the month of July (c) decreases in the month of July and increases in the month of January (d) increases during day time and decreases during night time 87. If a person moves from Chennai to Trichy, his weight (a) increases (b) decreases (c) remains same (d) increases and then decreases 88. An object of mass 10 kg is hanging on a spring scale which is attached to the roof n of a lift. If the lift is in free fall, the reading in the spring scale is l.i (a) 98 N (b) zero (c) 49 N (d) 9.8 N 89. If the acceleration due to gravity becomes 4 times its original value, then escape da speed ka (a) remains same (b) 2 times of original value (c) becomes halved (d) 4 times of original value vi 90. The kinetic energy of the satellite orbiting around the Earth is al (a) equal to potential energy (b) less than potential energy.k (c) greater than kinetic energy (d) zero w UNIT – 7 (PROPERTIES OF MATTER) w 91. Consider two wires X and Y. The radius of wire X is 3 times the radius of Y. If they w are stretched by the same load, then the stress on Y is (a) equal to that on X (b) thrice that on X (c) nine times that on X (d) Half that on X 92. If a wire is stretched to double of its original length, then the strain in the wire is (a) 1 (b) 2 (c) 3 (d) 4 93. The load – elongation graph of three wires of the same material are shown in figure. Which of the following wire is the thickest? (a) wire 1 (b) wire 2 (c) wire 3 (d) all of them have same thickness Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 11 1 rd 94. For a given material, the rigidity modulus is ( ) of Young’s modulus. Its 3 Poisson’s ratio is (a) 0 (b) 0.25 (c) 0.3 (d) 0.5 95. A small sphere of radius 2cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to (a) 22 (b) 23 (c) 24 (d) 25 96. Two wires are made of the same material and have the same volume. The area of cross sections of the first and the second wires are A and 2A respectively. If the length of the first wire is increased by Δ𝑙 on applying a force F, how much force is needed to stretch the second wire by the same amount? (a) 2F (b) 4F (c) 8F (d) 16 F 97. With an increase in temperature, the viscosity of liquid and gas, respectively will (a) increase and increase (b) increase and decrease (c) decrease and increase (d) decrease and decrease n 98. The Young’s modulus for a perfect rigid body is l.i (a) 0 (b) 1 (c) 0.5 (d) infinity da 99. Which of the following is not a scalar? (a) viscosity (b) surface tension ka (c) pressure (d) stress 100. If the temperature of the wire is increased, then the Young’s modulus will vi (a) remain the same (b) decrease al (c) increase rapidly (d) increase by very a small amount.k 101. Copper of fixed volume V is drawn into a wire of length 𝑙. When this wire is w subjected to a constant force F, the extension produced in the wire is Δ𝑙. If Y w represents the Young’s modulus, then which of the following graphs is a straight line? w (a) Δ𝑙 versus V (b) Δ𝑙 versus Y 1 (c) Δ𝑙 versus F (d) Δ𝑙 versus 𝑙 102. A certain number of spherical drops of a liquid of radius R coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then 1 1 (a) energy = 4 V T ( − ) is released r R 1 1 (b) energy = 3 V T ( + ) is absorbed r R 1 1 (c) energy =3 V T ( − ) is released r R (d) energy is neither released nor absorbed 103. The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied? (a) length = 200 cm, diameter = 0.5 mm (b) length= 200 cm, diameter = 1 mm (c) length = 200 cm, diameter = 2 mm (d) length= 200 cm, diameter = 3 m Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 12 104. The wettability of a surface by a liquid depends primarily on (a) viscosity (b) surface tension (c) density (d) angle of contact between the surface and the liquid 105. In a horizontal pipe of non-uniform cross section, water flows with a velocity of 1 ms-1 at a point where the diameter of the pipe is 20 cm. The velocity of water (1.5 m s-1) at a point where the diameter of the pipe is (in cm) (a) 8 (b) 16 (c) 24 (d) 32 UNIT – 8 (HEAT AND THERMODYNAMICS) 106. In hot summer after a bath, the body’s (a) internal energy decreases (b) internal energy increases (c) heat decreases (d) no change in internal energy and heat 107. The graph between volume and temperature in Charles’ law is (a) an ellipse (b) a circle n (c) a straight line (d) a parabola l.i 108. When a cycle tyre suddenly bursts, the air inside the tyre expands. This process is da (a) isothermal (b) adiabatic (c) isobaric (d) isochoric ka 109. An ideal gas passes from one equilibrium state (P1, V1, T1, N) to another equilibrium vi state (2P1, 3V1, T2, N). Then al 𝑇2 (a) T1 = T2 (b) T1 = (c) T1 = 6T2 (d) T1 = 3T2 6.k 110. When a uniform rod is heated, which of the following quantity of the rod will increase w (a) mass (b) weight w (c) center of mass (d) moment of inertia w 111. When food is cooked in a vessel by keeping the lid closed, after some time the steam pushes the lid outward. By considering the steam as a thermodynamic system, then in the cooking process (a) Q>0,W>0 (b) Q < 0, W > 0 (c) Q > 0, W < 0 (d) Q < 0, W < 0 112. When you exercise in the morning, by considering your body as thermodynamic system, which of the following is true? (a) ΔU > 0, W > 0 (b) ΔU < 0, W > 0 (c) ΔU < 0, W < 0 (d) ΔU = 0, W > 0 113. A hot cup of coffee is kept on the table. After some time, it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the following is true (a) ΔU > 0, Q = 0 (b) ΔU > 0, W < 0 (c) ΔU > 0, Q > 0 (d) ΔU = 0, Q > 0 Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 13 114. An ideal gas is taken from (Pi,Vi) to (Pf,Vf) in three different ways. Identify the process in which the work done on the gas the most. (a) Process A (b) Process B (c) Process C (d) Equal work is done in Process A,B &C 115. The V-T diagram of an ideal gas which goes through a reversible cycle A→B→C→D is shown below. (Processes D→A and B→C are adiabatic) The corresponding PV diagram for the process is (all figures are schematic) n l.i da (a) (b) ka vi al.k w (c) (d) w w 116. A distant star emits radiation with maximum intensity at 350 nm. The temperature of the star is (a) 8280 K (b) 5000K (c) 7260 K (d) 9044 K 117. Identify the state variables given here? (a) Q, T, W (b) P, T, U (c) Q, W (d) P, T, Q 118. In an isochoric process, we have (a) W=0 (b) Q=0 (c) ΔU = 0 (d) ΔT = 0 119. The efficiency of a heat engine working between the freezing point and boiling point of water is (a) 6.25% (b) 20% (c) 26.8% (d) 12.5% Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 14 120. An ideal refrigerator has a freezer at temperature −12°C. The coefficient of performance of the engine is 5. The temperature of the air (to which the heat ejected) is (a) 50°C (b) 45.2°C (c) 40.2°C (d) 37.5°C UNIT – 9 (KINETIC THEORY OF GASES) 121. A particle of mass m is moving with speed u in a direction which makes 60° with respect to x axis. It undergoes elastic collision with the wall. What is the change in momentum in x and y direction? n l.i da (a) ∆𝑝𝑥 = −𝑚𝑢, ∆𝑝𝑦 = 0 (b) ∆𝑝𝑥 = −2𝑚𝑢, ∆𝑝𝑦 = 0 (c) (d) ka ∆𝑝𝑥 = 0, ∆𝑝𝑦 = 𝑚𝑢 ∆𝑝𝑥 = 𝑚𝑢, ∆𝑝𝑦 = 0 122. A sample of ideal gas is at equilibrium. Which of the following quantity is zero? vi (a) rms speed (b) average speed al (c) average velocity (d) most probable speed 123. An ideal gas is maintained at constant pressure. If the temperature of an ideal gas.k increases from 100K to 10000K then the rms speed of the gas molecules w (a) increases by 5 times (b) increases by 10 times w (c) remains same (d) increases by 7 times w 124. Two identically sized rooms A and B are connected by an open door. If the room A is air conditioned such that its temperature is 4°C lesser than room B, which room has more air in it? (a) Room A (b) Room B (c) Both room has same air (d) Cannot be determined 125. The average translational kinetic energy of gas molecules depends on (a) number of moles and T (b) only on T (c) P and T (d) P only 126. If the internal energy of an ideal gas U and volume V are doubled then the pressure (a) doubles (b) remains same (c) halves (d) quadruples Cp 127. The ratio γ = for a gas mixture consisting of 8 g of helium and 16 g of oxygen Cv is (a) 23/15 (b) 15/23 (c) 27/17 (d) 17/2 Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 15 128. A container has one mole of monoatomic ideal gas. Each molecule has f degrees Cp of freedom. What is the ratio of γ = Cv f f f +2 (a) f (b) (c) (d) 2 f+2 f 129. If the temperature and pressure of a gas is doubled the mean free path of the gas molecules (a) remains same (b) doubled (c) tripled (d) quadrapoled 130. Which of the following shows the correct relationship between the pressure and density of an ideal gas at constant temperature? (a) (b) n l.i da (c) (d) ka vi al.k 131. A sample of gas consists of μ1 moles of monoatomic w molecules, μ2 moles of diatomic molecules and μ3 moles of linear triatomic w molecules. The gas is kept at high temperature. What is the total number of w degrees of freedom? (a) [3μ1 + 7(μ2 + μ3)] NA (b) [3μ1 + 7μ2 + 6μ3] NA (c) [7μ1 + 3(μ2 + μ3)] NA (d) [3μ1 + 6(μ2 + μ3)] NA 132. If SP and SV denote the specific heats of nitrogen gas per unit mass at constant pressure and constant volume respectively, then (a) SP - SV = 28R (b) SP - SV = R/28 (c) SP - SV = R/14 (d) SP - SV = R 133. Which of the following gases will have least rms speed at a given temperature? (a) Hydrogen (b) Nitrogen (c) Oxygen (d) Carbon dioxide 134. For a given gas molecule at a fixed temperature, the area under the Maxwell- Boltzmann distribution curve is equal to PV kT P (a) (b) (c) (d) PV kT PV NkT Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 16 135. The following graph represents the pressure versus number density for ideal gas at two different temperatures T1 and T2. The graph implies (a) T1 = T2 (b) T1 > T2 (c) T1 < T2 (d) Cannot be determined UNIT – 10 (KINETIC THEORY OF GASES) n 136. In a simple harmonic oscillation, the acceleration against displacement for one complete oscillation will be l.i da (a) an ellipse (b) a circle (c) a parabola (d) a straight line 137. A particle executing SHM crosses points A and B with the same velocity. Having ka taken 3 s in passing from A to B, it returns to B after another 3 s. The time period vi is al (a) 15 s (b) 6s (c) 12 s (d) 9s 138. The length of a second’s pendulum on the surface of the Earth is 0.9 m. The length.k of the same pendulum on surface of planet X such that the acceleration of the w planet X is n times greater than the Earth is w 0.9 0.9 (a) 0.9n (b) 𝑚 (c) 0.9 n2m (d) 𝑛 𝑛2 w 139. A simple pendulum is suspended from the roof of a school bus which moves in a horizontal direction with an acceleration a, then the time period is 1 1 (a) T∝ (b) T∝ g2 +a2 √g2 +a2 (c) T ∝ √g 2 + a2 (d) T∝ (g 2 + a2 ) 140. Two bodies A and B whose masses are in the ratio 1:2 are suspended from two separate massless springs of force constants kA and kB respectively. If the two bodies oscillate vertically such that their maximum velocities are in the ratio 1:2, the ratio of the amplitude A to that of B is k k 2k 8k (a) √2kB (b) √8kB (c) √kB (d) √kB A A A A 141. A spring is connected to a mass m suspended from it and its time period for vertical oscillation is T. The spring is now cut into two equal halves and the same mass is suspended from one of the halves. The period of vertical oscillation is T T (a) T ′ = √2 T (b) T′ = (c) T ′ = √2T (d) T′ = √ √2 2 Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 17 142. The displacement of a simple harmonic motion is given by y(t) = A sin (ωt + ϕ) where A is amplitude of the oscillation, ω is the angular frequency and ϕ is the phase. Let the amplitude of the oscillation be 8 cm and the time period of the oscillation is 24 s. If the displacement at initial time (t = 0 s) is 4 cm, then the displacement at t = 6 s is (a) 8 cm (b) 4 cm (c) 4 √3 cm (d) 8 √3 cm 143. A simple pendulum has a time period T1. When its point of suspension is moved vertically upwards according as y = k t2, where y is vertical distance covered and 𝑇12 k = 1 ms−2, its time period becomes T2. Then, is (g = 10 ms–2) 𝑇22 5 11 6 5 (a) (b) (c) (d) 6 10 5 4 144. An ideal spring of spring constant k, is suspended from the ceiling of a room and a block of mass M is fastened to its lower end. If the block is released when the spring is un-stretched, then the maximum extension in the spring is Mg Mg Mg Mg (a) 4 (b) (c) 2 (d) n k k k 2k 145. A pendulum is hung in a very high building oscillates to and fro motion freely like a l.i simple harmonic oscillator. If the acceleration of the bob is 16 ms−2 at a distance da of 4 m from the mean position, then the time period is (a) 2s (b) 1s (c) 2πs (d) πs ka 146. A hollow sphere is filled with water. It is hung by a long thread. As the water flows vi out of a hole at the bottom, the period of oscillation will (a) first increase and then decrease (b) first decrease and then increase al (c) increase continuously (d) decrease continuously.k 147. The damping force on an oscillator is directly proportional to the velocity. The units w of the constant of proportionality are w (a) kg m s−1 (b) kg m s−2 (c) kg s−1 (d) kg s 148. Let the total energy of a particle executing simple harmonic motion with angular w 𝜋 frequency is 1 rad s–1 is 0.256 J. If the displacement of the particle at time t= s 2 is 8 √3 cm then the amplitude of motion is (a) 8 cm (b) 16 cm (c) 32 cm (d) 64 cm 149. A particle executes simple harmonic motion and displacement y at time t0, 2t0 A+C and 3t0 are A, B and C, respectively. Then the value of ( ) is 2B (a) cos ωt0 (b) cos 2ωt0 (c) cos 3ωt0 (d) 1 150. A mass of 3 kg is attached at the end of a spring moves with simple harmonic motion on a horizontal frictionless table with time period 2π and with amplitude of 2m, then the maximum fore exerted on the spring is (a) 1.5 N (b) 3N (c) 6N (d) 12 N Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 18 UNIT – 11 (WAVES) 151. A student tunes his guitar by striking a 120 Hertz with a tuning fork, and simultaneously plays the 4th string on his guitar. By keen observation, he hears the amplitude of the combined sound oscillating thrice per second. Which of the following frequencies is the most likely the frequency of the 4th string on his guitar? (a) 130 (b) 117 (c) 110 (d) 120 152. A transverse wave moves from a medium A to a medium B. In medium A, the velocity of the transverse wave is 500 ms-1 and the wavelength is 5 m. The frequency and the wavelength of the wave in medium B when its velocity is 600 ms-1, respectively are (a) 120 Hz and 5 m (b) 100 Hz and 5 m (c) 120 Hz and 6 m (d) 100 Hz and 6 m 153. For a particular tube, among six harmonic frequencies below 1000 Hz, only four harmonic frequencies are given: 300 Hz, 600 Hz, 750 Hz and 900 Hz. What are n the two other frequencies missing from this list? l.i (a) 100 Hz, 150 Hz (b) 150 Hz, 450 Hz da (c) 450 Hz, 700 Hz (d) 700 Hz, 800 Hz 154. Which of the following options is correct? ka A B vi (1) Quality (A) Intensity al (2) Pitch (B) Waveform.k (3) Loudness (C) Frequency w Options for (1), (2) and (3), respectively are w (a) (B),(C) and (A) (b) (C), (A) and (B) w (c) (A), (B) and (C) (d) (B), (A) and (C) 155. Equation of travelling wave on a stretched string of linear density 5 g/m is y = 0.03 sin(450t – 9x), where distance and time are measured in SI units. The tension in the string is (a) 5N (b) 12.5 N (c) 7.5 N (d) 10 N 156. A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is (a) 4.30 (b) 0.23 (c) 5.30 (d) 1.23 157. A person standing between two parallel hills fi res a gun and hears the first echo after t1 sec and the second echo after t2 sec. The distance between the two hills is 𝒗(𝒕𝟏 −𝒕𝟐 ) 𝑣(𝑡1 𝑡2 ) (a) (b) 𝟐 2(𝑡1 + 𝑡2 ) 𝑣(𝑡1 + 𝑡2 ) (c) 𝑣 (𝑡1 + 𝑡2 ) (d) 2 Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929. https://www.kalvikadal.in https://material.kalvikadal.in RAJENDRAN M, M.Sc., B.Ed., C.C.A., P.G.T in PHYSICS, SRMMHSS, KAVERIYAMPOONDI : Page 19 158. An air column in a pipe which is closed at one end, will be in resonance with the vibrating body of frequency 83Hz. Then the length of the air column is (a) 1.5 m (b) 0.5 m (c) 1.0 m (d) 2.0 m 159. The displacement y of a wave travelling in the x direction is given by 𝝅 𝒚 = (𝟐𝐱𝟏𝟎−𝟑 )𝐬𝐢𝐧 (𝟑𝟎𝟎𝒕 − 𝟐𝒙 + ), where x and y are measured in metres and t 𝟒 in second. The speed of the wave is (a) 150 ms-1 (b) 300 ms-1 (c) 450 ms-1 (d) 600 ms-1 160. Consider two uniform wires vibrating simultaneously in their fundamental notes. The tensions, densities, lengths and diameter of the two wires are in the ratio 8: 1, 1: 2, x : y and 4 : 1 respectively. If the note of the higher pitch has a frequency of 360 Hz and the number of beats produced per second is 10, then the value of x : y is (a) 36: 35 (b) 35: 36 (c) 1: 1 (d) 1: 2 161. Which of the following represents a wave 𝟏 (a) (𝒙 − 𝒗𝒕)𝟑 (b) 𝒙(𝒙 + 𝒗𝒕) (c) (d) sin(𝒙 + 𝒗𝒕) n (𝒙 + 𝒗𝒕) 162. A man sitting on a swing which is moving to an angle of 600 from the vertical is l.i blowing a whistle which has a frequency of 2.0 k Hz. The whistle is 2.0 m from the da fixed support point of the swing. A sound detector which detects the whistle sound is kept in front of the swing. The maximum frequency the sound detector detected ka is vi (a) 2.027 kHz (b) 1.974 kHz (c) 9.74 kHz (d) 1.011 kHz al 𝟏 163. Let 𝒚 = at t = 0 s be the amplitude of the wave propagating in the positive x- 𝟏+𝒙𝟐.k direction. At t = 2 s, the amplitude of the wave propagating becomes 𝒚 = w 𝟏 𝟏 + (𝒙−𝟐)𝟐 w Assume that the shape of the wave does not change during propagation. The w velocity of the wave is (a) 0.5m s-1 (b) 1.0m s-1 (c) 1.5m s-1 (d) 2.0m s-1 164. A uniform rope having mass m hangs vertically from a rigid support. A transverse wave pulse is produced at the lower end. Which of the following plots shows the correct variation of speed v with height h from the lower end? (a) (b) (c) (d) Please send your Materials & Question Papers to [email protected] (or) Whatsapp - 9385336929.