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2020 18 questions

Q552020 · 6 Sept 2020
Which of the following statements is NOT correct regarding the travel of sound waves ?
1. A.Sound waves can travel through water
2. B.Sound waves can travel through air
3. C.Sound waves can travel through steel
4. D.Sound waves can travel through vacuum
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Answer: D
Q562020 · 6 Sept 2020
The correct relation between the radius of curvature $R$ and focal length $f$ of a spherical mirror is
1. A. $R = f$
2. B. $R = 2 f$
3. C. $R = 3 f$
4. D. $R = 4 f$
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Answer: B
Q572020 · 6 Sept 2020
A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of
1. A.reflection of light
2. B.scattering of light
3. C.refraction of light
4. D.polarization of light
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Answer: C
Q582020 · 6 Sept 2020
Light enters the eye through a thin membrane called
1. A.retina
2. B.cornea
3. C.pupil
4. D.iris
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Answer: B
Q592020 · 6 Sept 2020
Name the scientist who first used a glass prism to obtain the spectrum of sunlight
1. A.C. V. Raman
2. B.Lord Rayleigh
3. C.Isaac Newton
4. D.S. Chandrasekhar
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Answer: C
Q602020 · 6 Sept 2020
The cost of energy to operate an industrial refrigerator that consumes 5 kW power working 10 hours per day for 30 days will be (Given that the charge per kW.h of energy = ₹ 4)
1. A.₹ 600
2. B.₹ 6,000
3. C.₹ 1,200
4. D.₹ 1,500
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Answer: B
Q612020 · 6 Sept 2020
Which one of the following statements regarding magnetic field is NOT correct ?
1. A.Magnetic field is a quantity that has direction and magnitude
2. B.Magnetic field lines are closed curves
3. C.Magnetic field lines are open curves
4. D.No two magnetic field lines are found to cross each other
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Answer: C
Q722020 · 6 Sept 2020
Two equal resistors R are connected in parallel, and a battery of 12 V is connected across this combination. A dc current of 100 mA flows through the circuit as shown below : The value of R is
1. A.120 Ω
2. B.240 Ω
3. C.60 Ω
4. D.100 Ω
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Answer: B
Q732020 · 6 Sept 2020
Which one of the following is NOT the unit of energy ?
1. A.Joule
2. B.Watt-hr
3. C.Newton-metre
4. D. $kg - metre/se c^{2}$
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Answer: D
Q802020 · 6 Sept 2020
Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become
1. A.double
2. B.half
3. C.four times
4. D.one fourth
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Answer: B
Q822020 · 6 Sept 2020
Consider the following image : A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be
1. A.to the right
2. B.to the left
3. C.out of the page
4. D.into the page
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Answer: D
Q832020 · 6 Sept 2020
Which one of the following statements about sound is NOT correct ?
1. A.Sound travels at a speed slower than the speed of light
2. B.Sound waves are transverse waves
3. C.Sound waves are longitudinal waves
4. D.Sound travels faster in moist air than in dry air
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Answer: B
Q842020 · 6 Sept 2020
When the short circuit condition occurs, the current in the circuit
1. A.becomes zero
2. B.remains constant
3. C.increases substantially
4. D.keeps on changing randomly
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Answer: C
Q872020 · 6 Sept 2020
Which one of the following types of radiations has the smallest wave-length ?
1. A.Microwaves
2. B.Infra-red
3. C.Visible light
4. D.X-rays
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Answer: D
Q882020 · 6 Sept 2020
The instrument used for detecting the presence of electric current in a circuit is
1. A.Refractometer
2. B.Galvanometer
3. C.Viscometer
4. D.Diffractometer
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Answer: B
Q912020 · 6 Sept 2020
A lens has a power of $+ 2 \cdot 0 Dioptre$ . Which one of the following statements about the lens is true ?
1. A.The lens is concave and has a focal length of $0 \cdot 5 metre$
2. B.The lens is convex and has a focal length of $2 \cdot 0 metre$
3. C.The lens is convex and has a focal length of $0 \cdot 5 metre$
4. D.The lens is concave and has a focal length of $2 \cdot 0 metre$
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Answer: C
Q982020 · 6 Sept 2020
The refractive index of fused quartz is $1 \cdot 46$ and that of sapphire is $1 \cdot 77$ . If $v_{q}$ is the speed of light in quartz and $v_{s}$ is the speed of light in sapphire, then which one of the following relations is correct ?
1. A. $v_{q} > v_{s}$
2. B. $v_{s} > v_{q}$
3. C. $v_{s} = v_{q}$
4. D. $v_{s} = \frac{v _{q}}{2}$
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Answer: A
Q992020 · 6 Sept 2020
In case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is NOT correct ?
1. A.The image will be virtual
2. B.The image will be enlarged or magnified
3. C.The image will be formed at infinity
4. D.The image will be erect
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Answer: C