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2021 41 questions

Q892021 · 14 Nov 2021
Reverberation is a phenomenon associated with a
1. A.multiple refraction of sound.
2. B.multiple reflection of sound.
3. C.single refraction of sound.
4. D.single reflection of sound.
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Answer: B
Q902021 · 14 Nov 2021
Which among the following is true for propagation of sound waves?
1. A.Sound can travel in vacuum and it is a transverse wave in air.
2. B.Sound cannot travel in vacuum and it is a longitudinal wave in air.
3. C.Sound can travel in vacuum and it is a longitudinal wave in air.
4. D.Sound cannot travel in vacuum and it is a transverse wave in air.
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Answer: B
Q912021 · 14 Nov 2021
A tennis ball is thrown in the vertically upward direction and the ball attains a maximum height of 20 m. The ball was thrown approximately with an upward velocity of
1. A.8 m/s
2. B.12 m/s
3. C.16 m/s
4. D.20 m/s
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Answer: D
Q922021 · 14 Nov 2021
An object of mass 2000 g possesses 100 J kinetic energy. The object must be moving with a speed of
1. A.10.0 m/s
2. B.11.1 m/s
3. C.11.2 m/s
4. D.12.1 m/s
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Answer: A
Q962021 · 14 Nov 2021
The unit of the ratio between thrust and impulse is same as that of
1. A.frequency
2. B.speed
3. C.wavelength
4. D.acceleration
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Answer: A
Q972021 · 14 Nov 2021
Which one of the following figures correctly shows the path of a ray of light through a glass prism ?
1. A.Option A
2. B.Option B
3. C.Option C
4. D.Option D
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Answer: A
Q982021 · 14 Nov 2021
When a light beam falls on a triangular glass prism, a band of colours is obtained. Which one of the following statements is correct in this regard ?
1. A.Red light bends the most, as the refractive index of glass for red light is greatest.
2. B.Red light bends the most, as the refractive index of glass for red light is lowest.
3. C.Violet light bends the most, as the refractive index of glass for violet light is greatest.
4. D.Violet light bends the most, as the refractive index of glass for violet light is lowest.
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Answer: C
Q992021 · 14 Nov 2021
The image of an object formed by a plane mirror is
1. A.erect, real and larger.
2. B.erect, virtual and same size.
3. C.inverted, virtual and same size.
4. D.inverted, real and smaller.
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Answer: B
Q1002021 · 14 Nov 2021
Which one of the following is not a conservative force ?
1. A.Frictional force
2. B.Electric force
3. C.Gravitational force
4. D.Spring force
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Answer: A
Q1012021 · 14 Nov 2021
A negative work is done when an applied force F and the corresponding displacement S are
1. A.perpendicular to each other.
2. B.parallel to each other.
3. C.anti-parallel to each other.
4. D.equal in magnitude.
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Answer: C
Q532021 · 18 Apr 2021
The electrostatic potential doesn't depend on which of the following (1) It depends on the charge (2) It depends on the endpoints of the path through work done (3) It depends on the path taken for the work done (4) It depends on the amount of work done
1. A.Only statement 1
2. B.Only statement 2
3. C.Only statement 3
4. D.Only statement 4
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Answer: C
Q542021 · 18 Apr 2021
Mirage is an illustration of
1. A.only dispersion of light.
2. B.only reflection of light.
3. C.only total internal reflection of light.
4. D.both refraction and total internal reflection of light.
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Answer: D
Q572021 · 18 Apr 2021
Consider the following statements about Light year: 1. Light year is a unit for measurement of very large distances. 2. Light year is a unit for measurement of very large time intervals. 3. Light year is a unit for measurement of intensity of light. Which of the statements given above is/are correct?
1. A.1, 2 and 3
2. B.2 and 3 only
3. C.1 and 2 only
4. D.1 only
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Answer: D
Q582021 · 18 Apr 2021
Which one of the following regarding density of water at atmospheric pressure is correct?
1. A.Density of water at $4^{\circ} C$ is $1000 kg/ m^{3}$ .
2. B.Density of water at $0^{\circ} C$ is $1000 kg/ m^{3}$ .
3. C.Density of water at $0^{\circ} C$ is $100 kg/ m^{3}$ .
4. D.Density of water at $4^{\circ} C$ is $10 kg/ m^{3}$ .
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Answer: A
Q592021 · 18 Apr 2021
Which of the following pairs of physical phenomenon and the discover is/are correctly matched? $1. James Chadwick 2. Albert Einstein 3. Marie Curie Photoelectric Neutron Radium$ Select the correct answer using the code given below:
1. A.1, 2 and 3
2. B.1 and 2 only
3. C.2 and 3 only
4. D.3 only
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Answer: D
Q602021 · 18 Apr 2021
LED (a semi-conductor device) is an abbreviation that stands for
1. A.Licence for Energy Dectector.
2. B.Light Energy Device.
3. C.Light Emitting Diode.
4. D.Lost Energy Detector.
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Answer: C
Q612021 · 18 Apr 2021
The statement "friction force is a contact force while magnetic force is a non-contact force" is
1. A.always true.
2. B.true only at 0°C.
3. C.a false statement.
4. D.either true or false depending upon the temperature of the surroundings.
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Answer: A
Q692021 · 18 Apr 2021
Which one of the following is the lowest possible temperature?
1. A.0° Celsius
2. B.-073° Celsius
3. C.-173° Celsius
4. D.-273° Celsius
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Answer: D
Q712021 · 18 Apr 2021
The image we see in plane mirror is
1. A.real and thus can be photographed.
2. B.virtual and nearer than the object.
3. C.virtual and is laterally inverted.
4. D.real but cannot be photographed.
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Answer: C
Q732021 · 18 Apr 2021
Point of Origin of Earthquake Wave is known as
1. A.Epicenter
2. B.Focus
3. C.Photosphere
4. D.Seismic Zone
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Answer: B
Q812021 · 18 Apr 2021
Twinkling of stars is due to
1. A.Particular frequencies of the starlight
2. B.reflection of starlight from the oceanic surface
3. C.atmospheric refraction of starlight
4. D.magnetic field of Earth
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Answer: C
Q822021 · 18 Apr 2021
Which one of the following cannot be the unit of frequency of a sound wave?
1. A.dB
2. B. $s^{- 1}$
3. C.Hz
4. D. $mi n^{- 1}$
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Answer: A
Q832021 · 18 Apr 2021
'Beats' is a phenomenon that occurs when frequencies of two harmonic waves are
1. A.equal
2. B.far apart
3. C.multiples of each other
4. D.nearly same
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Answer: D
Q842021 · 18 Apr 2021
Light waves are incident on an air-glass boundary. Some of the light waves are reflected and some are refracted in the glass. Which one of the following properties is the same for the incident wave and the refracted wave?
1. A.Speed
2. B.Direction
3. C.Brightness
4. D.Frequency
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Answer: D
Q892021 · 18 Apr 2021
Which of the following are the primary colours of light?
1. A.Yellow, Red and Green
2. B.Blue, Red and Green
3. C.Violet, Red and Yellow
4. D.Indigo, Violet and Green
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Answer: B