Option B – Go to bed or go to sleep expresses the meaning of the given idiom.

Option D- Self-centered is the correct antonym for philanthropic.

Additional Information: -

* Unsparing means merciless.

* Benign means kind or gentle.

* Benevolent means kind, friendly and helpful to others.

* Self-centered means thinking only about yourself and not about other people.

Let’s understand the meaning of the given words:

Insinuate= Give to understand

Conceal= Prevent from being seen or discovered

Hint= Make an indirect suggestion; intimate by a hint

Violate= Act in disregard of laws, rules, contracts, or promises

Concur= Be in accord; be in agreement

Hence, option B is the correct answer.

The error is in part C of the given sentence.

‘would have been saved’ should be used in place of ‘would be’ because the event occurred in the past -had reached is past perfect.

The error is in part c of the given sentence.

Add article ‘A’ after walk in part C of the sentence.

For the gravitational potential at center of a hollow spherical shell

 the shell is compressed to half its radius the mass will still remain same.
The new potential will be

V′p=−GM/(R/2)=−2GM/R

Thus, due to the negative sign, when the radius is halved the potential decreases.

Hence, option (b) is the correct answer.

⟹ F=q(B × v)

From the given figure, we find that force acting on the electron in a direction out of the plane of paper.

Hence option B is correct.

According to the Kelvin-Planck statement of Second law of thermodynamics, a working engine can’t convert all heat extracted from the source into mechanical work, it must also reject some heat to the sink at lower temperature.

An important consequence of Second law is that it forbids the efficiency of a heat engine to become perfect unity.

However, there are some limitations to the Second law.

It hasn’t been proved, just observed experimentally.

It is applicable only to cyclic processes and it is applicable only in a particular system.

Second law does not talk about the direction of heat transfer at all.

Hence D is the correct option.

Properties of images formed by a plane mirror are :-

1. They are erect i.e upright.

2. They are virtual i.e they cannot be formed on a screen.

3. They are laterally inverted, i.e left and right interchange. Application AMBULANCE.

4. The image formed is at the same distance between the object and image from the mirror.

5. The size of the image and object is the same.

 The metal which exists as a liquid at room temperature is mercury. Non-metal which exist as a liquid at room temperature is bromine. Hence, the correct answer is B

● D₂O (Deuterium Oxide) is used as a moderator in nuclear reactor plants because it can slow down a moving neutron.

● Is it also called heavy water.

● Boron and graphite rods can also be used as moderators.

● MgO is used in groundwater treatment.

● CaO is used in whitewash.

● CaSO₄ is used as a fertilizer and in making chalks.

Therefore, D is the correct option.

 Conclusion of Rutherford's scattering experiment:

1. Maximum space inside the atom is vacant because most of the alpha particles passed through the gold foil without getting any deflection.

2. Very few particles were deflected from their path, which indicates that the positive charge of the atom occupies very little space.

3. A very small fraction of alpha particles was deflected by very large angles, which indicates that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom.

From the resultant data of the experiment, he concluded that the radius of the nucleus is approximately times less than an atom.

According to his experiment, Rutherford put forward the model of an atom, which had the following features:

1. There is a positively charged centre present in an atom called the nucleus. Approximately all the mass of an atom resides in the nucleus.

2. The electrons revolve around the nucleus in prescribed orbits.

3. The size of the nucleus is very smaller than an atom.

 Parenchyma is a living tissue composed of large, loosely packed, roughly rounded or cube shaped cells with thin cell walls, large sap vacuoles and large intercellular spaces. In its unspecialized form it is called packaging tissue as parenchyma fills in spaces between other tissues. This packaging tissue is important in healing wound and regenerating plant part. Hence option B is correct.

The North Atlantic air mass is much warmer, whereas the Arctic air mass is extremely cold. When they come into contact with each other, a strong temperature contrast is created, resulting in the formation of a strong low pressure.

Temperate cyclones form when warm tropical air collides with cold polar air at latitudes ranging from 40 to 60 degrees north & south. A waveforms when cold polar air moves in a westerly direction as well as warm tropical air moves in an easterly direction.

Hence, option B is correct.

• The Guinea Current is a slow warm water current that flows to the east along the Guinea coast of West Africa.

• The Oyashio Current is a cold subarctic ocean current that flows south and circulates counterclockwise in the western North Pacific Ocean.

• The Canary Current is a cold current off the coast of northwest Africa.

• The Kuroshio is a warm north-flowing ocean current on the west side of the North Pacific Ocean.

Hindustan Socialist Republican Association (HSRA), previously known as the Hindustan Republican Army and Hindustan Republican Association (HRA), was an Indian revolutionary organisation founded by Ram Prasad Bismil, Ashfaqulla Khan, Sachindra Nath Bakshi, Sachindranath Sanyal and Jogesh Chandra Chatterjee.Other members were Bhagat Singh,Jatindranath ,Ajay Gosh and Phanindranath Gosh."Hence Option D is correct".

Additional Info:

• The Revolutionary, were produced as evidence in the Kakori conspiracy case of 1924.The outcome was that four leaders – Ashfaqullah Khan, Ram Prasad Bismil, Roshan Singh and Rajendra Lahiri – were hanged in December 1927 and a further 16 imprisoned for lengthy terms.

• The HSRA's manifesto titled Philosophy of the Bomb was written by Bhagwati Charan Vohra.

Explanation: The Russian Revolution was made in 1917, is also known as the Bolshevik revolution. It was named by the fact that Bolsheviks played a major role in the success of the revolution and also determined or affected the policies of the nation. Hence, statement I is correct. The Tsar, Nicholas II, belonged to the Russian Romanov dynasty. The Tsar used his military and diplomatic strength against all democratic movements in Europe. Till February 1917, the Russia was governed by an autocratic ruler known as Tsar. Hence, statement II is correct.

Source: NIOS, French and Russian Revolution

The Attorney General is required to advise the Government of India on legal issues referred to them. They also carry out other legal responsibilities delegated to them by the President. The Attorney General has the right of audience in all the Indian courts, and also the right to participate in Parliamentary proceedings but not to vote.

Hence, option A is correct.

A common High Court for the two or more states can be established by a law passed by the Parliament according to Article 231.
Hence, Option A is correct.

Extra Points:

● Lawn Bowls is a sport in which the objective is to roll biased balls so that they stop close to a smaller ball called a ‘jack’ or a ‘kitty’. The matches are played on a Lawn Bowls Green within a rink area- there are usually six rinks per green.

● Under Lawn Bowls, in singles competition, the first to score 21 points will win, whereas, in pairs, triples, and fours competition, that team in the game that has amassed the most points in total will win the game.

Hence, Option B is correct.

This year’s participants include Australia, Canada, India, France, Germany, Indonesia, Japan, Malaysia, the Netherlands, New Zealand, the Philippines, the Republic of Korea, Singapore, Thailand, the UAE, the UK and the US.

Hence, Option D is correct.