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2019 38 questions

Q512019 · 17 Nov 2019
A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their center of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is true?
1. A.The ring has higher kinetic energy
2. B.The disc has higher kinetic energy
3. C.The ring and the disc have the same kinetic energy
4. D.Kinetic energies of both the bodies are zero since they are not in linear motion
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Answer: A
Q522019 · 17 Nov 2019
In which of the following phenomena do heat waves travel along a straight line with the speed of light?
1. A.Thermal conduction
2. B.Thermal convection
3. C.Thermal radiation
4. D.Both, thermal conduction and radiation
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Answer: C
Q542019 · 17 Nov 2019
When a ball bounces off the ground, which of the following changes suddenly? (Assume no loss of energy to the floor)
1. A.Its speed
2. B.Its momentum
3. C.Its kinetic energy
4. D.Its potential energy
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Answer: B
Q552019 · 17 Nov 2019
If an object moves at a non-zero constant acceleration for a certain interval of time, then the distance it covers in that time
1. A.depends on its initial velocity.
2. B.is independent of its initial velocity.
3. C.increases linearly with time.
4. D.depends on its initial displacement.
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Answer: A
Q562019 · 17 Nov 2019
A solid disc and a solid sphere have the same mass and same radius. Which one has the higher moment of inertia about its centre of mass?
1. A.The disc
2. B.The sphere
3. C.Both have the same moment of inertia
4. D.The information provided is not sufficient to answer the question
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Answer: A
Q572019 · 17 Nov 2019
Two substances of densities $ρ_{1}$ and $ρ_{2}$ are mixed in equal volume and their relative density is 4. When they are mixed in equal masses, relative density is 3. The values of $ρ_{1}$ and $ρ_{2}$ respectively are
1. A.6, 2
2. B.3, 5
3. C.12, 4
4. D.9, 3
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Answer: A
Q582019 · 17 Nov 2019
A car starts from Bengaluru, goes 50 km in a straight line towards south, immediately turns around and returns to Bengaluru. The time taken for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip
1. A.is 0.
2. B.is 50 km/hr.
3. C.is 25 km/hr.
4. D.cannot be calculated without knowing acceleration.
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Answer: A
Q592019 · 17 Nov 2019
“The sum of emf’s and potential differences around a closed loop equals zero” is a consequence of
1. A.Ohm’s law.
2. B.Conservation of charge.
3. C.Conservation of momentum.
4. D.Conservation of energy.
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Answer: D
Q622019 · 17 Nov 2019
Consider the following part of an electric circuit: The total electrical resistance in the given part of the electric circuit is
1. A. $\frac{15}{8}$ ohm
2. B. $\frac{15}{7}$ ohm
3. C.15 ohm
4. D. $\frac{17}{3}$ ohm
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Answer: B
Q632019 · 17 Nov 2019
Which one of the following statements regarding lenses is not correct?
1. A.A convex lens produces both real and virtual images.
2. B.A concave lens produces both real and virtual images.
3. C.A convex lens can produce images equal, greater and smaller than the size of the object.
4. D.A concave lens always produces images smaller than the size of the object.
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Answer: B
Q642019 · 17 Nov 2019
10 g of ice at -10°C is mixed with 10 g of water at 0°C. The amount of heat required to raise the temperature of mixture to 10°C is
1. A.400 cal
2. B.550 cal
3. C.1050 cal
4. D.1200 cal
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Answer: C
Q662019 · 17 Nov 2019
Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on 1. Supply voltage. 2. Current passing through the coil. 3. Time for which voltage is supplied. Select the correct answer from among the following:
1. A.1, 2 and 3
2. B.1 and 2 only
3. C.1 only
4. D.2 and 3 only
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Answer: A
Q672019 · 17 Nov 2019
A pendulum clock is lifted to a height where the gravitational acceleration has a certain value g. Another pendulum clock of same length but of double the mass of the bob is lifted to another height where the gravitational acceleration is g/2. The time period of the second pendulum would be: (in terms of period T of the first pendulum)
1. A. $2 T$
2. B. $\frac{1}{2} T$
3. C. $22 T$
4. D.T
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Answer: A
Q682019 · 17 Nov 2019
The loudness of sound depends upon the
1. A.velocity of sound waves in the medium.
2. B.amplitude of the sound waves.
3. C.frequency of the sound waves.
4. D.frequency and velocity of the sound waves.
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Answer: B
Q692019 · 17 Nov 2019
Two bodies of mass M each are placed R distance apart. In another system, two bodies of mass 2M each are placed $\frac{R}{2}$ distance apart. If F be the gravitational force between the bodies in the first system, then the gravitational force between the bodies in the second system will be
1. A.16 F
2. B.1 F
3. C.4 F
4. D.None of the above
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Answer: A
Q702019 · 17 Nov 2019
Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
1. A.the holes through the fibre are extremely fine.
2. B.light rays are absorbed at the entry end and relieved at the exit end of the fibre.
3. C.scattering of light occurs inside the fibre.
4. D.successive total internal reflections occur as a ray moves through the fibre.
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Answer: D
Q712019 · 17 Nov 2019
Compared to audible sound waves, ultrasound waves have
1. A.higher speed.
2. B.higher frequency.
3. C.longer wavelength.
4. D.both higher speed and frequency.
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Answer: B
Q722019 · 17 Nov 2019
A rigid body of mass $2 kg$ is dropped from a stationary balloon kept at a height of $50 m$ from the ground. The speed of the body when it just touches the ground and the total energy when it is dropped from the balloon are respectively (acceleration due to gravity = $9.8 m/ s^{2}$ )
1. A. $980 m. s^{- 1}$ and $980 J$
2. B. $980 m. s^{- 1}$ and $980 J$
3. C. $980 m. s^{- 1}$ and $980 J$
4. D. $980 m. s^{- 1}$ and $980 J$
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Answer: D
Q732019 · 17 Nov 2019
The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be
1. A.318 K
2. B.45 K
3. C.62.8 K
4. D.335.8 K
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Answer: A
Q742019 · 17 Nov 2019
Radiations coming from the Sun are mostly in the form of
1. A.light only.
2. B.light and long wavelength infrared.
3. C.light and short wavelength infrared.
4. D.both short and long wavelength infrared.
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Answer: C
Q752019 · 17 Nov 2019
Which of the following are the characteristics of electromagnetic waves? 1. They are elastic waves. 2. They can also move in vacuum. 3. They have electric and magnetic components which are mutually perpendicular. 4. They move with a speed equal to 3 lakh meters per second. Select the correct answer using the code given below:
1. A.1, 2, 3 and 4
2. B.1, 2 and 4 only
3. C.2 and 3 only
4. D.3 and 4 only
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Answer: C
Q512019 · 21 Apr 2019
The light energy escaping from the Sun can be spread by
1. A.a shower of rain drops
2. B.a plane mirror
3. C.a convex lens
4. D.a combination of a convex lens and a concave lens
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Answer: A
Q522019 · 21 Apr 2019
The correct sequence of energy transfer that occurs when an apple falls to the ground is
1. A.Gravitational potential energy → heat energy to air → kinetic energy → heat energy to ground and apple → sound energy
2. B.Gravitational potential energy → sound energy → kinetic energy → heat energy to air → heat energy to ground and apple
3. C.Gravitational potential energy → kinetic energy → heat energy to air → heat energy to ground and apple → sound energy
4. D.Gravitational potential energy → kinetic energy → sound energy → heat energy to air → heat energy to ground and apple
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Answer: C
Q532019 · 21 Apr 2019
Which one of the following can charge an insulator?
1. A.Current electricity
2. B.Static electricity
3. C.Magnetic field
4. D.Gravitational field
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Answer: B
Q542019 · 21 Apr 2019
At 20°C, the speed of sound in water is approximately
1. A.330 m/s
2. B.800 m/s
3. C.1500 m/s
4. D.5000 m/s
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Answer: C