Electrical energy is transmitted over long distances at high alternating voltages by the use of a transformer. Choose the correct statements from the following :
(A) Higher voltage implies less power loss.
(B) The alternating magnetic flux induces eddy currents in the iron core and causes heating.
(C) Step up transformer increases the current by reducing the voltage in the above transformer.
(D) Transmission lines can be made thinner to reduce power loss.
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Which of the following statements are correct ?
A. The saturation current is constant with collector plate potential for different frequencies of incident radiation.
B. The saturation current is different with collector plate potential for different frequencies of incident radiation.
C. The saturation current is different with collector plate potential for different intensity of incident radiation.
D. The saturation current is constant with collector plate potential for different intensity of incident radiation.
E. Below threshold frequency no photo electrons are emitted.
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A square coil of side 10 cm, 500 turns and resistance 3 \(\Omega\) is placed with its plane perpendicular to the horizontal component of the Earth's magnetic field. It is rotated about vertical axis passing through centre by 180° in 0.25 second. Estimate the magnitude of the emf and current induced in the coil. Horizontal component of the Earth's magnetic field at the place is 3.0 \(\times 10^{-5}\) T.

Which of the following is NOT a property of charges?

An insulating rod of length \( L \) carries charge \( q \) distributed uniformly on it. The rod is pivoted at one end and is rotated at a frequency \( f \) about a fixed perpendicular axis. Then the magnetic dipole moment of the system is :

Match the electromagnetic waves in Column-l with production methods in Column-II

List-I (Electromagnetic Waves)	List-II (Production Methods)
(A) Microwaves	(I) LC oscillator
(B) Infrared	(II) Magnetron
(C) X-rays	(III) Vibration of atoms/molecules
(D) Radio waves	(IV) Bombarding large atomic number metal target with fast-moving electrons

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In an AC circuit, the instantaneous values of emf and current are \( E = 100 \sin(314t) \) V and \( I = \sin(314t + \pi/3) \) A. The average power consumed in the circuit is:

Pyramid of which of the following is inverted?
(A) The pyramid of biomass in sea
(B) The pyramid of numbers in grassland
(C) The pyramid of biomass in terrestrial food chain
(D) The pyramid of number of insects feeding on a big tree
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Which of the following is NOT a characteristic of an ideal contraceptive?
(A) It should be user friendly
(B) It should be easily available
(C) It should be irreversible
(D) It should be with no or least side effects
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Arrange the following steps involved in Polymerase Chain Reaction in correct sequence.
A. Denaturation of dsDNA by heating.
B. Extension of Primer
C. Annealing of Primer
D. Amplification of DNA
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Two solenoids of the same length and the same cross-sectional area have 400 turns and 250 turns, respectively. The ratio of self-inductance of the two solenoids, respectively, is

Match the complex species given in List-l with the possible isomerism given in List-ll:

List-l Complex species	List-ll Isomerism
(A) \(\left[ Co \left( NH _3\right)_4 Cl _2\right]^{+}\)	(I) optical
(B) cis- \(\left[ Co ( en )_2 Cl _2\right]^{+}\)	(II) ionization
(C) \(\left[ Co \left( NH _3\right)_5\left( NO _2\right)\right] Cl _2\)	(III) coordination
(D) \(\left[ Co \left( NH _3\right)_6\right]\left[ Cr ( CN )_6\right]\)	(IV) geometrical

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Arrange the following compounds in increasing order of their basicity
(A) Aniline
(B) p-Nitroaniline
(C) p-Toluidine
(D) p-Methoxyaniline
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