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Question : Who found an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles in 1911?
Option 1: Chadwick and Lawrence
Option 2: Fermi and Meitner
Option 3: Geiger and Nuttall
Option 4: Soddy and Aston
Correct Answer: Geiger and Nuttall
Solution : The correct answer is Geiger and Nuttall.
Geiger and Nuttall found an empirical link between the alpha decay half-life and the energy of the released alpha particles in 1911. This connection, known as the Geiger-Nuttall law or Geiger-Nuttall rule, contributed significantly to our
Question : Asha bought a saree for INR 4000 and sold it for INR 4400. Her profit percentage is:
Option 1: 5%
Option 2: 80%
Option 3: 10%
Option 4: 40%
Correct Answer: 10%
Solution : Cost price = INR 4000 Selling price = INR 4400 Profit = selling price – cost price = 4400 – 4000 = INR 400 Profit percentage = $\frac{400}{4000}×100 = 10\%$ Hence, the correct answer is 10%.
Question : Comprehension:
Read the passage and answer the questions that follow.
The drainage systems of India are mainly controlled by the broad relief features of the subcontinent. Accordingly, the Indian rivers are divided into two major groups: the Himalayan rivers and the Peninsular rivers.
Apart from originating from the two major physiographic regions of India, the Himalayan and the Peninsular rivers are different from each other in many ways. Most of the Himalayan rivers are perennial. It means that they have water throughout the year. These rivers receive water from rain as well as from melted snow from the lofty mountains. The major Himalayan rivers are the Indus, the Ganga, and the Brahmaputra. These rivers are long and are joined by many large and important tributaries. A river along with its tributaries may be called a river system. The two major Himalayan rivers, the Indus and the Brahmaputra originate from the north of the mountain ranges. They cut through the mountains making gorges in the upper course. The perennial Himalayan rivers have long courses from their source to the sea. They perform intensive erosional activity in their upper courses and carry huge loads of silt and sand with their swift current. In the middle and the lower courses, these rivers form meanders, oxbow lakes, levees, and many other depositional features in their floodplains as their speed slackens. They also have well-developed deltas.
A large number of the Peninsular rivers like the Godavari, Kaveri, and Krishna are seasonal, as their flow is dependent on rainfall. During the dry season when it doesn’t rain, even the large rivers have reduced flow of water in their channels. The Peninsular rivers have shorter and shallower courses as compared to their Himalayan counterparts. However, some of them originate in the central highlands and flow towards the west. Most of the rivers of peninsular India originate in the Western Ghats and flow towards the Bay of Bengal.
Question:
Himalayan rivers are never dry because they:
Option 1: have a shorter and shallower course
Option 2: are dependent on rainfall only
Option 3: are fed by glaciers and rainfall
Option 4: originate in the Western Ghats
Correct Answer: are fed by glaciers and rainfall
Solution : The correct choice is the third option.
Explanation: The passage mentions that most of the Himalayan rivers are perennial, meaning they have water throughout the year. The reason for their continuous flow is explained further: these rivers receive water from
Question : Which among the following is not an east-flowing river?
Option 1: Brahmani
Option 2: Subarnarekha
Option 3: Periyar
Option 4: Palar
Correct Answer: Periyar
Solution : The correct answer is Periyar.
The Periyar River is the longest in the state of Kerala. It is also known as the lifeline of Kerala. The major tributaries of the Periyar are Muthirapuzha River, Mullayar River and Cheruthoni River. It originates in the Western
Question : The distance between the centres of two circles of radii 3 cm and 8 cm is 13 cm. If the points of contact of a direct common tangent to the circles are P and Q, then the length of the line segment PQ is:
Option 1: 11.9 cm
Option 2: 12 cm
Option 3: 11.58 cm
Option 4: 11.5 cm
Correct Answer: 12 cm
Solution : Given: Two circles of radii 3 cm and 8 cm, the distance between the centres = 13 cm and PQ is the direct common tangent. We know, The length of the direct common tangent of two circles = $\sqrt{d^2-(r_1-r_2)^2}$ Here, the distance between the
Question : Directions: Find the odd word pair from the given responses.
Option 1: Diabetes
Option 2: Swine flu
Option 3: Chickenpox
Option 4: Malaria
Correct Answer: Diabetes
Solution : Let's check each option – First option: Diabetes; Diabetes is a deficiency disease caused by a deficiency of insulin. Second option: Swine flu; Swine flu is a type of influenza A virus. Third option: Chickenpox; Chickenpox is caused by the varicella-zoster virus. Fourth option: Malaria;
Question : Directions: In the given figure, what will come opposite to the face containing A?
Option 1: E
Option 2: D
Option 3: C
Option 4: G
Correct Answer: E
Solution : As per the properties of the dice, the opposite faces of a dice cannot appear together and also the sides of opposite faces cannot touch each other. The opposite pairs of faces are as follows –
Therefore, based on the diagram, the face opposite to
Question : Directions: In the question, a part of the sentence is in bold. Below are given alternatives to the bold part at (1), (2), and (3) that may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is (4).
I visited my aunt just before a week.
(1) a week before
(2) a week earlier
(3) a week ago
(4) No improvement
Option 1: (1)
Option 2: (2)
Option 3: (3)
Option 4: (4)
Correct Answer: (3)
In the original sentence, just before a week is not the correct way to express the time frame. A week ago is the appropriate way to indicate a past time point.
Therefore, the correct sentence is, "I
Question : Which of the following principles is used to produce 'low temperatures'?
Option 1: Superconductivity
Option 2: Joule-Kelvin effect
Option 3: Thermo-electric effect
Option 4: Adiabatic demagnetisation
Correct Answer: Adiabatic demagnetisation
Solution : The correct option is Adiabatic demagnetisation.
To achieve low temperatures, an adiabatic demagnetisation method is helpful. This technique helps to achieve low temperatures of around 1K for the electronic paramagnetic salts. However, the temperature can be as low as possible for the nuclear
Question : Select the option that can be used as a one-word substitute for the given group of words.
One who does not get tired easily
Option 1: Indefatigable
Option 2: Pedantic
Option 3: Recluse
Option 4: Libertine
Correct Answer: Indefatigable
Solution : The correct choice is the first option.
Indefatigable originates from fatigue, which means a feeling of constant exhaustion, and it is used to describe someone who shows untiring effort and remains diligent all the time. This makes it the correct one-word substitute for
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