A piece of paper and a coin both having the same mass are dropped from the 10th floor of a building. The piece of paper would take more time to reach the ground because
- A.gravitational pull on the paper is less than the coin.
- B.buoyant force on the piece of paper is more than that on the coin.
- C.buoyant force on the coin is more and acts in the downward direction.
- D.the piece of paper takes a longer path to reach the ground.
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Answer: B
During sunrise and sunset, sun appears reddish-orange because
- A.during that time sun emits only reddish-orange light.
- B.all other colours are absorbed by the atmosphere.
- C.reddish-orange light is least scattered by the atmosphere.
- D.all other colours apart from reddish-orange are reflected back by the atmosphere.
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Answer: C
Ohm's law can also be taken as a statement for
- A.conservation of energy.
- B.conservation of electric charge.
- C.conservation of angular momentum.
- D.non-conservation of momentum of the flowing charges.
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Answer: D
Motion of a particle can be described in x-direction by x = a sin ωt, and y-direction by y = b cos ωt. The particle is moving on
- A.a circular path of radius 'a'.
- B.a circular path of radius 'b'.
- C.an elliptical path.
- D.a straight line.
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Answer: C
A bullet of mass 20 gm is fired in the horizontal direction with a velocity 150 m/s from a pistol of mass 1 kg. Recoil velocity of the pistol is
- A.3 m/s
- B.3 km/s
- C.300 m/s
- D.1/3 m/s
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Answer: A
What should be the reading of the voltmeter in the circuit given above? (All the resistances are equal to 1 Ω and the battery is of 1.5 volt)
- A.1.5 volt
- B.0.66 volt
- C.1 volt
- D.2 volt
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Answer: C
The plot given above represents the velocity of a particle (in m/s) with time (in seconds). Assuming that the plot represents a semi-circle, distance traversed by the particle at the end of 7 seconds is approximately
- A.19 m
- B.7 m
- C.3.2 m
- D.4.75 m
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Answer: Dropped in the final answer key (full marks to everyone)
Suppose we have an iron nail and an iron ball of same mass. When submerged in water, the iron ball may float but the nail always sinks. This is because
- A.buoyant force on the ball is larger than that of the nail due to their shapes.
- B.viscous force on the ball is higher.
- C.viscous force on the nail is higher.
- D.gravitational force affects the ball differently from the nail.
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Answer: A
An electric heater is rated 1500 watt. If electric power costs ₹ 2 per kilo-watt-hour, then the cost of power for 10 hours running of the heater is
- A.₹ 30
- B.₹ 15
- C.₹ 150
- D.₹ 25
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Answer: A
Rays of light get refracted while passing from air to glass because
- A.density of glass is higher than that of air.
- B.they cannot be reflected from a glass surface.
- C.glass absorbs energy from the light rays.
- D.speed of light in glass is less than the speed of light in air.
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Answer: D
White light while passing through a glass prism breaks up into light of different colours because
- A.refractive index of glass for different colours of light is different.
- B.glass prism absorbs white light and emits lights of several colours in different directions.
- C.of total internal reflection of white light on surfaces of the prism.
- D.of the interference of different colours inside the prism.
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Answer: A
Which one among the following situations is best represented by the velocity - time plot shown above ?
- A.Uniform motion of a particle on a circle
- B.Accelerated motion of a particle which has a non-zero initial velocity
- C.Decelerated motion of a particle which has an initial non-zero velocity
- D.Decelerated motion of a particle which has no initial velocity
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Answer: C
When long dry hair is brushed the strands often move away from each other because while brushing
- A.air is being blown through the strands.
- B.static electric charges are being induced on the hair.
- C.mechanical energy is being transferred into heat energy.
- D.the gravitational attraction among the strands becomes smaller.
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Answer: B
A pressure cooker works on the principle of
- A.elevation of boiling point of water by application of pressure.
- B.making the food-grains softer by application of pressure.
- C.making the food-grains softer by application of pressure and temperature.
- D.keeping the food-grains inside steam for a longer time.
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Answer: A
The presence of sulphur in gunpowder
- A.decreases the ignition temperature.
- B.increases the final temperature.
- C.increases explosiveness of the gunpowder.
- D.makes the powder smokeless.
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Answer: A
Which of the following statements in connection with the properties of water is/are correct?
1. Water has higher specific heat in comparison with other liquid.
2. Water has no dipole moment.
3. Water has low heat of vaporization.
Select the correct answer using the code given below.
- A.1 only
- B.2 and 3
- C.1 and 3
- D.3 only
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Answer: A
Water is a good solvent. This is due to high
- A.dielectric constant of water
- B.surface tension of water
- C.specific heat of water
- D.heat of fusion of water
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Answer: A
An ant is moving on thin (negligible thickness) circular wire. How many coordinates do you require to completely describe the motion of the ant?
- A.One
- B.Two
- C.Three
- D.Zero
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Answer: A
A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by
- A.left-hand thumb rule for up-current and right-hand thumb rule for down-current
- B.right-hand thumb rule for up-current and left-hand thumb rule for down-current
- C.right-hand thumb rule for both up and down currents
- D.left-hand thumb rule for both up and down currents
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Answer: C
If an object undergoes a uniform circular motion, then its
- A.acceleration remains uniform
- B.velocity changes
- C.speed changes
- D.velocity remains uniform
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Answer: B
A car is moving with a uniform speed. However its momentum is changing. Then the car
- A.may be on an elliptical path
- B.is moving on a straight path without acceleration
- C.is moving on a straight path with acceleration
- D.is moving without any acceleration
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Answer: A
Ohm’s law defines
- A.a resistance
- B.current only
- C.voltage only
- D.both current and voltage
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Answer: A
A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is
- A.zero
- B.towards the centre of the circle
- C.away from the centre along the radius of the circle
- D.perpendicular to the radius and along the velocity
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Answer: B
An object is undergoing a non-accelerated motion. Its rate of change in momentum is
- A.a non-zero constant
- B.zero
- C.not a constant
- D.None of the above
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Answer: B
Imagine a current-carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is
- A.clockwise
- B.anti-clockwise
- C.into the page
- D.out of the page
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Answer: A
