If the focal length of objective lens is increased, then magnifying power of
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(a) microscope will increase but that of telescope decrease (b) microscope and telescope both will increase (c) microscope and […]
If n₁, n₂ and n₃ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by
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(a) 1/n=1/n₁+1/ […]
Hydrogen atom in ground state is excited by a monochrmatic radiation of λ=975 Å. Number of spectral lines in the resulting spectrum emitted will be
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(a) 3 (b) 2 (c) 6 (d) […]
Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment m. Which configuration has highest net magnetic dipole moment?
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(1) a (2) b (3) c […]
Dependence of intensity of gravitational field (E) of earth with distance(r) from centre of earth is correctly represented by
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(a)
(b)
(c)
(d)
Correct Answer: Explanation:
No explanation available. Be the […]
Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is Δl. Which of the following graphs […]
Certain quantity of water cools from 70⁰ C to 60⁰C in the first 5 minutes and to 54⁰ C in the next 5 minutes. The temperature of the surroundings is
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(a) 45⁰ C […]
A transformer having efficiency of 90% is working on 200 V and 3kW power supply. If the current in the secondary coil is 6 A, then the voltage across the secondary coil and the current […]
A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure. The potential difference developed across the ring when its […]
A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is
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(a) P₀ V₀ (b) 2P₀ V₀ (c) P₀ V₀/2 (d) zero
Correct […]
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