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AIR Spotlight – Impact of Duty Reduction on Fuels and Edible Oil Prices

AIR Spotlight is an insightful program featured daily on the All India Radio Newsonair. In this program, many eminent panellists discuss issues... View Article

Distribution of Temperature in the Earth’s Atmosphere

The interaction of insolation with the atmosphere and the earth’s surface creates heat, which is measured in terms of temperature. While heat... View Article

Sevottam Model

Sevottam is a generic framework for achieving excellence in public service delivery and was proposed by the 2nd Administrative Reforms Commission... View Article

Officers’ List in Mughal Empire

The Mughal era in India brought many major changes in the social, economic, cultural administrative, trade, lifestyle aspects of the country. The... View Article

Civil Services Prelims 6 Months Strategy – Tips to Clear UPSC Prelims in 6 Months

The Civil Services Exam conducted by UPSC is not an exam that can be cracked without a proper study plan and strategy. A minimum of dedicated six... View Article

Defamation in India [UPSC Polity Notes]

Defamation is defined in section 499 of the Indian Penal Code as- “Whoever, by words either spoken or intended to be read, or by signs or by... View Article

09 Nov 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 9th Nov 2021. Important news and views to boost... View Article

AUKUS – All You Need to Know

Australia, the U.K. and the U.S. (AUKUS) have come together to establish a new trilateral security partnership for the Indo-Pacific called the... View Article

Lenz’s law applies to

1) Electrostatics 2) Lenses 3) Electromagnetic induction 4) Cinema slides Answer: 3) Electromagnetic induction Solution: Len's law... View Article

Faraday’s laws are a consequence of the conservation of

1) Energy 2) Energy and magnetic field 3) Charge 4) Magnetic field Answer: 1) Energy Solution: Faraday's laws are a consequence of the... View Article

A coil of 40 Ω resistance has 100 turns and a radius of 6 mm is connected to an ammeter of resistance of 160 ohms. The coil is placed perpendicular to the magnetic field. When the coil is taken out of the field, 32 µC charge flows through it. The intensity of the magnetic field will be

1) 6.55 T 2) 5.66 T 3) 0.655 T 4) 0.566 T Answer: 4) 0.566 T Solution: Total charge flow, Q = 32 x 10-6 C Total resistance, R = 160 +... View Article

A coil having an area 2m² is placed in a magnetic field which changes from 1 Wb/m² to 4 Wb/m² in an interval of 2 second. The e.m.f. induced in the coil will be

1) 4 V 2) 3 V 3) 1.5 V 4) 2 V Answer: 2) 3 V Solution: A = 2m2 (dB/dt) = [(4 - 1)]/2 = (3/2) T/s e = dΦ/dt =... View Article

A 50 turns circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coils is

1) 1.77 volts 2) 17.7 volts 3) 177 volts 4) 0.177 volts Answer: 2) 17.7 volts Solution: N = 50 turns r = 3 x 10-2 m B1 = 0.10 B2 =... View Article

According to phenomenon of mutual inductance

1) The mutual inductance does not depend on geometry of two coils involved 2) The mutual inductance depends on the intrinsic magnetic property,... View Article

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

1) A current will be induced in a coil 2) no current will be induced in a coil 3) Only an e.m.f. will be induced in the coil 4) An e.m.f. and... View Article

According to Lenz’s law of electromagnetic induction

1) The induced e.m.f. is not in the direction opposing the change in magnetic flux 2) The relative motion between the coil and magnet produces a... View Article

A coil of inductive reactance 31Ω has a resistance of 8Ω. It is placed in series with a condenser of capacitive reactance 25Ω. The combination is connected to an a.c. source of 110 volts. The power factor of the circuit is.

1) 0.80 2) 0.33 3) 0.56 4) 0.64 Answer: 1) 0.80 Solution: = 8/10 = 0.8 ... View Article

The power factor of a good choke coil is

1) Nearly zero 2) Exactly zero 3) Nearly one 4) Exactly one Answer:1) Nearly zero Solution: The phase difference 'θ' between the... View Article

The same current is flowing in two alternating circuits. The first circuit contains only inductance and the other contains only a capacitor. If the frequency of the emf of ac is increased the effect on the value of the current will be.

1) Increase in the first circuit and decrease in other 2) Increase in both the circuit 3) Decrease in both the circuit 4) Decrease in the... View Article

In an ac circuit with voltage V and current I, the power dissipated is.

1) VI 2) (1/2)VI 3) (1/√2)VI 4) Depends on the phase between V and I Answer: 4) Depends on the phase between V and I Solution: P =... View Article

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