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A 60 HP electric motor lifts an elevator with a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, the speed of the elevator at full load is close to (Given 1 HP = 746 W, g = 10 m/s²)

a. 1.5 m/s b. 1.7 m/s c. 2.0 m/s d. 1.9 m/s Answer: (d) P = Fv + Mgv Applied... View Article

Which of the following gives reversible operation?

Answer: (c) Since, there is only one input hence the operation is reversible.

A polarizer-analyzer set is adjusted such that the intensity of light coming out of the analyzer is just 10 % of the original intensity. Assuming that the polarizer-analyzer set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero is

a. 45o b. 90o c. 71.6o d. 18.40 Answer: (d) Intensity after polarisation through polaroid = Iocos2φ So, 0.1Io =... View Article

A container with 1 kg of water in it is kept in sunlight, which causes the water to get warmer than the surroundings. The average energy per unit time per unit area received due to the sunlight is 700 Wm⁻² and it is absorbed by the water over an effective area of 0.05 m². Assuming that the heat loss from the water to the surroundings is governed by Newton’s law of cooling, the difference (in ℃) in the temperature of water and the surroundings after a long time will be _____________.

(Ignore the effect of the container, and take constant for Newton’s law of cooling = 0.001 s−1, the Heat capacity... View Article

The inductors of two LR circuits are placed next to each other, as shown in the figure. The values of the self-inductance of the inductors, resistances, mutual-inductance and applied voltages are specified in the given circuit. After both the switches are closed simultaneously, then total work done by the batteries against the induced in the inductors by the time the currents reach their steady-state values is________mJ.

Answer: 55

A cubical solid aluminium (bulk modulus = -V (dP/dV) = 70 GPa) block has an edge length of 1m on the surface of the earth. It is kept on the floor of a 5 km deep ocean. Taking the average density of water and the acceleration due to gravity to be 10³ kg m⁻³ and 10 ms⁻², respectively, the change in the edge length of the block in mm is _____.

Answer: 0.23 to 0.24 B = V (dP/dV) Finding the magnitude of the change in the volume:- 70 x 109... View Article

Two capacitors with capacitance values C₁ = 2000 and plusmn; 10 pF and C₂ = 3000 ± 15 pF are connected in series. The voltage applied across this combination is = 5.00 ± 0.02 V. The percentage error in the calculation of the energy stored in this combination of capacitors is _______.

Answer: 1.30% ET = (1/2) Ceq V2 Assuming (Ceq = C) 1/C = 1/C1 + 1/C2 = 1/2000 + 1/3000 =... View Article

03 Aug 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 03rd Aug 2021. Important news and... View Article

Where did Mahatma Gandhi first try out his new method of peaceful Non-Cooperation Satyagraha?

Mahatma Gandhi first deployed his method of peaceful non-cooperation, which came to be known as Satyagraha, at Champaran in modern-day... View Article

Gangotri Glacier [UPSC Environment & Ecology]

The Gangotri glacier is an important topic for both the geography and environment & ecology sections of the UPSC exam.... View Article

What is Article 9 in the Indian constitution?

Article 9 of the Indian Constitution states that “Persons voluntarily acquiring citizenship of a foreign State not to be citizens”.... View Article

Who comes under IAS Officer?

Positions and designations held by IAS officers in their career are: Cabinet Secretary Additional and Joint Secretary District magistrate Divisional... View Article

How to buy Yojana magazine?

One of the most important magazine for UPSC Preparation can be subscribed from the official site [Official website – https://yojana.gov.in/].... View Article

When did the non-cooperation campaign of the Khilafat movement begin?

The Khilafat Committee on August 31, 1921, launched a campaign of non-cooperation on August 31, 1921. This led to the... View Article

Can anyone become an officer at 21?

Yes, it is possible to become an IAS officer at the age of 21. The only thing necessary is that... View Article

How many amendments are in the Constitution 2021?

The Indian constitution came into force in 1950. Since then, there are 104 amendments to the constitution of India. Further... View Article

How much does Yojana magazine cost?

Yojana is one of the important magazines which is helpful for UPSC Preparation. Yojana is a monthly magazine, and it... View Article

How many articles are in the Constitution today?

According to legislative.gov.in, as of 9th of December 2020, there are 395 articles, 12 schedules and 22 parts in the... View Article

What is the last date for UPSC 2021?

The last date to fill UPSC Online application was 24th March, 2021. The Prelims exam for UPSC 2021 is scheduled... View Article

What is the last date for the UPSC exam?

As per the official UPSC 2021 notification released on March 4, 2021, the online registration for all eligible candidates was... View Article

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