Class 10 Physics Past Papers MCQs Grand Practice Test by admin | Class 10 MCQs Tests | 0 comments 9 Class 10 PhysicsPast Papers MCQsGrand Practice Test 1 / 135 The unit of e.m.f in SI system is volt, which is equal to: { JC }^{ -1 } { Jm }^{ -1 } J { JS }^{ -1 } 2 / 135 One of the isotopes of Uranium is ^{ 236 }{ U }_{ 92 } . The number of neutrons in this isotope is: 142 236 146 144 3 / 135 An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. The focal length of the mirror is: -20 cm -8.2 cm -4.1 cm -9.9 cm 4 / 135 For finding a virtual and erect image by a converging lens, object should be placed: Between Pole and F At F Between F and 2F Beyond F 5 / 135 The magnifying power of a simple microscope is given as: \frac { L }{ { f }_{ o } } (1+\frac { d }{ { f }_{ e } } ) 1+\frac { d }{ f } \frac { { f }_{ o } }{ { f }_{ e } } \frac { q }{ p } 6 / 135 The process by which electrons are emitted by a hot metal surface is known as: Evaporation Boiling Conduction Thermionic emission 7 / 135 How many times speed of sound is greater in water than air? 3 times 4 times 5 times 2 times 8 / 135 Capacitance is defined as: VC \frac { V }{ Q } QV \frac { Q }{ V } 9 / 135 During fission of 1 kg of uranium-235 _______ energy is released. 67 x 10^{ 10 }J 60 x 10^{ 8 }J 66 x 10^{ 9 }J 65 x 10^{ 8 }J 10 / 135 The unit of electric potential is: Js { JC }^{ -1 } { Jm }^{ -1 } J 11 / 135 The intensity level of mosquito buzzing is: 40 dB 30 dB 10 dB 20 dB 12 / 135 The Audible Frequency Range for human beings is from 20 Hz to: 200,000 Hz 20,000 Hz 200 Hz 2000 Hz 13 / 135 Two resistors of 20\Omega each are connected in parallel with a battery of 10V, the total current passing through the circuit is: 3A 4A 1A 2A 14 / 135 The sound energy passing per unit area per second is called: Frequency Pitch of sound Loudness Intensity of sound 15 / 135 What is the length of second’s pendulum? 1.02 mm 1.02 Km 1.02 cm 1.02 m 16 / 135 If speed of sound is 340 ms^{-1} at normal temperature in air we can hear the echo after: 0.1 second 0.2 second 2 second 1 second 17 / 135 The human ear can respond to the intensities ranging from: { 10 }^{ -14 }\quad W{ m }^{ -2 } to 100 W{ m }^{ -2 } { 10 }^{ -13 }\quad W{ m }^{ -2 } to 10 W{ m }^{ -2 } { 10 }^{ -11 }\quad W{ m }^{ -2 } to 0.1 W{ m }^{ -2 } { 10 }^{ -12 }\quad W{ m }^{ -2 } to 1 W{ m }^{ -2 } 18 / 135 Approximate speed of sound in distilled water at 25 °C is: 1498 { ms }^{ -1 } 1298 { ms }^{ -1 } 1398 { ms }^{ -1 } 1198 { ms }^{ -1 } 19 / 135 What happens to the atomic number of an element which emits one alpha particle and a beta particle? Decrease by 2 Decrease by 1 Increase by 1 Stay the same 20 / 135 The loudness of a sound is most closely related to: Amplitude Wavelength Frequency Period 21 / 135 S.I unit of spring constant “K” is: Nm Nm^{ -1 } Nm^{ -2 } N^{ -1 }m 22 / 135 A ray of light in glass is incident on an air surface at an angle greater than the critical angle, the ray will: Refract only Diffract only Reflect only Partially Reflect and Partially Refract 23 / 135 If the mass of bob of a pendulum is increased by a factor of ‘2’ then the period of pendulum motion will: Increase a factor of ‘4’ Remains same Increase a factor of ‘2’ Increase a factor of \sqrt { 2 } 24 / 135 Capacitance is defined as: \frac { Q }{ V } \frac { V }{ Q } \frac { V }{ C } QV 25 / 135 The SI unit of electric potential difference is: joule ampere coulomb volt 26 / 135 What is the power of a lamp connected to a 12V source when it carries 2.5 A current? 30 W 14.5 W 4.8 W 60 W 27 / 135 The half life of a certain isotope is 1 day. What is the quantity of isotope after 2 days? \frac { 1 }{ 8 } None of these \frac { 1 }{ 4 } \frac { 1 }{ 2 } 28 / 135 In Vacuum, all electromagnetic waves have the same: Wavelength Speed Amplitude Frequency 29 / 135 Waves transfer: Velocity Energy Frequency Wave Length 30 / 135 The pendulum clock was invented by: Huygens Galileo Newton Faraday 31 / 135 Which of the following is NOT processing? Calculating Gathering Manipulating Arranging 32 / 135 Which one is incorrect when three capacitors are connected in parallel? Q={ Q }_{ 1 }{ +Q }_{ 2 }{ +Q }_{ 3 } { Q }_{ 1 }={ Q }_{ 2 }={ Q }_{ 3 }=Q { V }_{ 1 }={ V }_{ 2 }={ V }_{ 3 }=V { C }_{ eq }={ C }_{ 1 }{ +C }_{ 2 }{ +C }_{ 3 } 33 / 135 Which of the following equations is correct for magnification? \frac { { h }_{ o }^{ 2 } }{ { h }_{ i }^{ 2 } } \frac { { q }^{ 2 } }{ { p }^{ 2 } } \frac { { h }_{ o } }{ { h }_{ i } } \frac { q }{ p } 34 / 135 The focal length of a convex lens of power5 D is ______ cm. 5 20 50 10 35 / 135 If the length of the simple pendulum is halved its new time period ‘T’ will become: \sqrt { 2 } T \frac { T }{ \sqrt { 2 } } \frac { T }{ 2 } 2T 36 / 135 Which one is OHMIC in nature? Thermister Filament Lamp Fixed Resistor Variable Resistor 37 / 135 Endoscope which is used to diagnose bladder is called: Bronchoscope Cystoscope Gastroscope Microscope 38 / 135 If the time period of simple pendulum is one second, then its length on earth will be: 1.25 m 2.25 m 3.25 m 0.25 m 39 / 135 Kilowatt-hour is a large unit to measure: Electric energy Electric potential Electric flux Electric field intensity 40 / 135 Five joules of work is needed to shift 10C charge from one place to another. The potential difference between the places is: 0.5V 5V 2V 10V 41 / 135 House Safety Wiring is connected in: Gates Parallel At Random Series 42 / 135 The isotope ^{ 1 }{ U }_{ 1 } contains: No neutron One neutron Two neutrons Four neutrons 43 / 135 What is the frequency of second pendulum? 1.5 Hz 0.5 Hz 1 Hz 2 Hz 44 / 135 How is energy from the sun released? Nuclear Fusion Burning of gases Chemical reaction Nuclear Fission 45 / 135 One bel is equal to: 10 dB 100 dB 1000 dB 1 dB 46 / 135 For the diagnosis of brain tumor _______ is used. Iodine-131 Phosphorus-32 Cobalt-60 Carbon-14 47 / 135 The combined resistance of two identical resistors, connected in series is 8Ω. Their combined resistance in a parallel arrangement will be: 4Ω 12Ω 2Ω 8Ω 48 / 135 Five joules of work is needed to shift 5C of charge from one place to another. The potential difference between the places is: 4 volt 3 volt 2 volt 1 volt 49 / 135 The output of a NAND gate is zero when: Any of its inputs is 1 Both of its inputs are zero Both of its inputs are 1 Any of its inputs is zero 50 / 135 In case of vibratory motion, time period is reciprocal of the: Velocity Wavelength Distance Frequency 51 / 135 An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror? -4.1 cm -9.9 cm -20 cm -8.2 cm 52 / 135 In vacuum, all electromagnetic waves have the same: Amplitude Wavelength Frequency Speed 53 / 135 Focal Length of Spherical Mirror is related to the Radius of Curvature by: F=2R F=R F = \frac { R }{ 2 } F=1.2 R 54 / 135 Loudness of sound depends upon: Frequency Time period Wavelength Amplitude 55 / 135 The combined resistance of two identical resistors, connected in series is 8Ω. Their combined resistance in a parallel arrangement will be: 4Ω 2Ω 8Ω 12Ω 56 / 135 NOT Gate is also called: Adder Inverter Convertor Subtractor 57 / 135 What is the size of Nucleus? 10^{-10} m 10^{-14} m 10^{-22} m 10^{-18} m 58 / 135 The turn ratio of a transformer is 10. It means: N_{ S }=10{ N }_{ p } l_{ S }=\frac { 10 }{ { l }_{ p } } V_{ S }=\frac { { V }_{ p } }{ 10 } N_{ S }=\frac { { N }_{ p } }{ 10 } 59 / 135 Kilowatt hour is a unit of: Power Energy Resistance Current 60 / 135 Capacitance is defined as: \frac { V }{ Q } \frac { Q }{ V } QV { QV }^{ 2 } 61 / 135 Three resistors of 2Ω each, connected in parallel are equivalent to a resistance of: 3.33 Ω 12 Ω 0.66 Ω 6 Ω 62 / 135 Two small charged spheres are separated by 2 mm. Which of the following would produce the greatest attractive force? -1q and -4q +1q and +4q +2q and +2q +2q and -2q 63 / 135 If 5 joule of work is needed to shift the 10 coulomb charge from one place to another place then the potential between the plates will be: 5 volt 10 volt 2 volt 0.5 volt 64 / 135 S.I unit of charge is: Joule Coulomb Joule per second Farad 65 / 135 The half-life of Krypton is 3 minutes. Out of 100g of Krypton, how much will be after 9 minutes? 6.25g 12.5g 50g 25g 66 / 135 When uranium (92 protons) ejects a beta particle, how many protons will be in the remaining nucleus? 89 protons 93 protons 90 protons 91 protons 67 / 135 AND gate can be formed by using two: NOT gates NOR gates OR gates NAND gates 68 / 135 The direction of induced e.m.f in a circuit is in accordance with conservation of: Energy Mass Momentum Charge 69 / 135 If X=A.B, then X=1, when: A is ‘0’ and B is ‘1’ A is ‘1’ and B is ‘0’ A and B are ‘1’ A or B are ‘0’ 70 / 135 The turn ratio of a transformer is 10. It means: { I }_{ S }=10{ I }_{ P } { N }_{ S }=10{ N }_{ P } { N }_{ S }=\frac { { N }_{ P } }{ 10 } { V }_{ S }={ V }_{ P }\times 10 71 / 135 The SI unit of electromotive force is: Joule Newton Dioptre Volt 72 / 135 1 pF = ? { 10 }^{ 9 }F { 10 }^{ 12 }F { 10 }^{ -12 }F { 10 }^{ -9 }F 73 / 135 What is the refractive index of Ice? 1.43 2.21 1.31 2.42 74 / 135 An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror? 9.9 cm 4.1 cm -9.9 cm -8.2 cm 75 / 135 A totally reflecting prism has one of its angle equal to 90° and the remaining two angles are equal to: 45° and 60° 45° and 45° 30° and 60° 30° and 45° 76 / 135 Speed of light in water is approximately: 3 x { 10 }^{ 7 }{ ms }^{ -1 } 2.3 x { 10 }^{ 8 }{ ms }^{ -1 } 3 x { 10 }^{ 8 }{ ms }^{ -1 } 2.0 x { 10 }^{ 8 }{ ms }^{ -1 } 77 / 135 The electrical power is given by: P = VIt P = \frac { { V }^{ 2 } }{ { R }^{ 2 } } P = { I }^{ 2 }{ R }^{ 2 } P = VI 78 / 135 According to Right Hand Rule for a current carrying conductor, current will be in the direction of: Forefinger Curling fingers Thumb Opposite to thumb 79 / 135 Two charged spheres are separated by 2 mm. Which of the following pairs would have the highest attractive force? -1q and -4q +2q and -2q +2q and +2q +1q and +4q 80 / 135 The half life of a certain isotope is 1 day. What is quantity of the isotope after 2 days? One-eighth One-half One third One-quarter 81 / 135 Release of energy by the Sun is due to: Nuclear Fission Burning of gases Nuclear Fusion Chemical reaction 82 / 135 1 eV is equal to: 1.6 x 10^{19} J 1.6 x 10^{9} J 1.6 x 10^{-19} J 1.6 x 10^{-9} J 83 / 135 In Vacuum, all Electro Magnetic Waves have the same: Frequency Amplitude Speed Wave Length 84 / 135 Which is the correct order of radiations for penetrating ability? { P }_{ \gamma }\le { P }_{ \beta }\le { P }_{ \alpha } { P }_{ \beta }<{ P }_{ \alpha }<{ P }_{ \gamma } { P }_{ \alpha }>{ P }_{ \beta }>{ P }_{ \gamma } { P }_{ \alpha }<{ P }_{ \beta }<{ P }_{ \gamma } 85 / 135 The direction of induced e.m.f in a circuit is determined in accordance with law of conservation of: Mass Charge Energy Momentum 86 / 135 The SI unit of intensity of sound is: { Wm }^{ -3 } Wm { js }^{ -1 }{ m }^{ -2 } { js }^{ -2 }{ m }^{ -2 } 87 / 135 When a ball is gently displaced from the centre of a bowl, it starts oscillating about the centre due to: Force of gravity Force of friction Magnetic force Elastic force 88 / 135 The presence of magnetic field can be detected by a: Stationary Negative Charge Stationary Positive Charge Small mass Magnetic Compass 89 / 135 Which of the following characteristics of waves is independent of others? Frequency Amplitude Wave length Speed 90 / 135 If we double the distance between two point charges then coulomb’s force will: Increase 2 times Decrease 2 times Decrease 4 times Increase 4 times 91 / 135 If the length of a simple pendulum is doubled, then its new frequency f' becomes: \frac { f }{ \sqrt { 2 } } 2f \sqrt { 2 } f \frac { f }{ 2 } 92 / 135 In case of OR and AND operation, if switches S1 and S2 both are open then the lamp is: OFF ON Neither ON nor OFF Sometimes ON and sometimes OFF 93 / 135 The equivalent capacitance of series capacitors is ________ the capacitance of any individual capacitor in the combination. Greater than Equal to Sum of Less than 94 / 135 A ray of light passing through air with speed 3\times { 10 }^{ 8 }\quad { ms }^{ -1 } enters into glass of refractive index 1.52, the speed in glass will be: 1.5\times { 10 }^{ 8 }\quad { ms }^{ -1 } 2.2\times { 10 }^{ 8 }\quad { ms }^{ -1 } 3\times { 10 }^{ 8 }\quad { ms }^{ -1 } 1.97\times { 10 }^{ 8 }\quad { ms }^{ -1 } 95 / 135 In concave mirror, which surface is reflecting? Outer curved surface All of these Side of mirror Inner curved surface 96 / 135 The half life of a certain isotope is 1 day. What is quantity of the isotope after 2 days? One half Double One quarter One eighth 97 / 135 The particles emitted from a hot cathode surface are called: Positive ions Electrons Negative ions Protons 98 / 135 What is the relationship between resistance and length of a conductor? Inverse proportion Both are equal to each other Direct proportion Both are logarithmic to each other 99 / 135 One pico farad (PF) is equal to: { 10 }^{ 9 }F 1 x { 10 }^{ -9 }F 1 x { 10 }^{ -12 }F { 10 }^{ 12 }F 100 / 135 The index of refraction depends on: The image distance The object distance The speed of light The focal length 101 / 135 Two capacitors of 20\muF each are connected in series with a battery of 10V. The total charge passing through the circuit is: 300\muC 100\muC 200\muC 400\muC 102 / 135 The direction of induced e.m.f in a circuit is in accordance with conservation of: Energy Momentum Mass Charge 103 / 135 The loudness of a sound is most closely related to: Amplitude Frequency Period Wavelength 104 / 135 How long does it take a current of 10 mA to deliver 30 C of charge? 300 s 3 s 30 s 3000 s 105 / 135 If radius of curvature is 10 cm then focal length of convex lens is: 5 cm 2.5 cm 10 cm 20 cm 106 / 135 Capacitance is defined as: C = \frac { V }{ Q } C = \frac { Q }{ V } C = QV C = QV^{ 2 } 107 / 135 AND gate can be formed using two: OR gates NOR gates NAND gates NOT gates 108 / 135 Which radio isotope is used for cancerous tumour? Iodine-131 Phosphorous-32 Cobalt-60 Carbon-14 109 / 135 Speed of sound in vacuum is: 210ms^{ -1 } 332ms^{ -1 } 280ms^{ -1 } Zero 110 / 135 The output of a NAND gate is 0 when: Any of its inputs is 0 Any of its inputs is 1 Both of its inputs are 1 Both of its inputs are 0 111 / 135 What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A? 30W 4.8W 60W 14.5W 112 / 135 Image formed by a camera is: Real, inverted and diminished Real, inverted and magnified Virtual, upright and diminished Virtual, upright and magnified 113 / 135 If turn ratio of a transformer is 100 then: { N }_{ S }=\frac { { N }_{ P } }{ 100 } { V }_{ S }=\frac { { V }_{ P } }{ 100 } { I }_{ S }=100\quad { I }_{ P } { N }_{ S }=100\quad { N }_{ P } 114 / 135 The direction of induced e.m.f in a circuit is in accordance with conservation of: Momentum Charge Energy Mass 115 / 135 The property of sound wave that distinguishes between shrill and grave sound is: Quality Pitch Loudness Intensity 116 / 135 The instrument used to see the distant objects is called: Microscope Spectrometer Telescope Convex lens 117 / 135 The inner part of fiber optics is called: Metal jacket Boundary Cladding Core 118 / 135 If F=0.08N and X=4cm then value of “K” is: 0.4 Nm^{ -1 } 4 Nm^{ -1 } 0.2 Nm^{ -1 } 2 Nm^{ -1 } 119 / 135 Two small charged spheres are separated by 2 mm. Which of the following would produce the greatest attractive force? +2q and -2q +1q and +4q -1q and -4q +2q and +2q 120 / 135 A step-up transformer: Increases the input voltage Has more turns in the primary coil Has less turns in the secondary coil Increase the input current 121 / 135 The intensity level of faintest audible sound in decibel is: { 10 }^{ -12 } dB 100 dB 10 dB 0 dB 122 / 135 A converging mirror with a radius of 20cm creates a real image 30cm from the mirror. What is the object distance? -15 cm -20 cm -7.5 cm -5.0 cm 123 / 135 Waves transfer: Velocity Energy Wave Length Frequency 124 / 135 The characteristics of sound by which a loud and a faint sound can be distinguished is: Quality of sound Pitch of sound Intensity of sound Loudness of sound 125 / 135 The unit of power of lens is: Joule Dioptre Watt Js^{-2} 126 / 135 The index of refraction depends upon: Object distance Speed of light Focal length Image distance 127 / 135 The SI unit of intensity of sound is: Wm^{ -3 } Wm^{ -2 } Wm^{ -1 } Wm 128 / 135 Rainbow is formed due to: Total Internal Reflection Reflection Diffraction Dispersion 129 / 135 When we double the voltage in a simple circuit, we double the: Current Resistance Both a and b Power 130 / 135 The critical angle of water will be: 18.8° 38.8° 48.8° 28.8° 131 / 135 Which one is not true for electric power? P = \frac { QV }{ t } P = IR P = IV P = { I }^{ 2 }R 132 / 135 What is the displacement of an object in simple harmonic motion when K.E=P.E? x = \frac { { x }_{ o } }{ \sqrt { 2 } } x = \frac { { x }_{ o } }{ 4 } x = \frac { { x }_{ o }^{ 2 } }{ 3 } x = { x }_{ o } 133 / 135 If X=A.B, then ‘X’ is ‘1’, when: A is ‘1’ and B is ‘0’ A or B are ‘0’ A is ‘0’ and B is ‘1’ A and B are ‘1’ 134 / 135 What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A current? 30 W 60 W 4.5 W 4.8 W 135 / 135 The magnitude of the sensation produced on the ear by a sound is called its: Intensity Quality Loudness Pitch Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Submit a Comment Cancel replyYou must be logged in to post a comment.

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