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Question : Which among the following is a covalent compound?
Option 1: Calcium chloride
Option 2: Magnesium fluoride
Option 3: Sodium chloride
Option 4: Carbon tetrachloride
Correct Answer: Carbon tetrachloride
Solution : The correct answer is Carbon tetrachloride.
Atoms join together in a covalent bond by exchanging electrons. Nonmetals typically form covalent bonds with one another. Four chlorine atoms symmetrically arranged as corners in a tetrahedral configuration and joined to a central carbon atom by a
Question : Who has been re-appointed, in August 2019, as the head coach of the Indian men's cricket team till 2021 by the Kapil Dev-led Cricket Advisory Committee (CAC)?
Option 1: Ravi Shastri
Option 2: Anil Kumble
Option 3: Gary Kirsten
Option 4: John Wright
Correct Answer: Ravi Shastri
Solution : The correct answer is Ravi Shastri.
Ravi Shastri was reappointed by the Cricket Advisory Committee led by Kapil Dev as the head coach of the Indian men's Cricket team from August 2019 till 2021. Ravi Shastri is a former Indian cricketer and a
Question : The blood vessels that carry blood from the heart to the various parts of the body are called:
Option 1: Arteries
Option 2: Veins
Option 3: Septum
Option 4: Capillaries
Correct Answer: Arteries
Solution : The correct option is Arteries.
The blood vessels that carry blood from the heart to various parts of the body are called arteries. Arteries are responsible for transporting oxygenated blood (except for the pulmonary artery, which carries deoxygenated blood to the lungs for oxygenation) and
Question : Two circles touch each other externally at any point C. PQ is the direct common tangent to both the circles touching the circles at point P and point Q. If the radii of the circles are 36 cm and 16 cm, respectively, then the length of PQ is:
Option 1: 42 cm
Option 2: 24 cm
Option 3: 48 cm
Option 4: 36 cm
Correct Answer: 48 cm
Solution : $R = 36$ cm $r = 16$ cm $\therefore$ PQ = $\sqrt{d^2-(R-r)^2}$ = $\sqrt{(R+r)^2-(R-r)^2}$ = $\sqrt{(R^2+r^2+2Rr-(R^2-2Rr+r^2)}$ = $\sqrt{4Rr}$ = $\sqrt{4×36×16}$ = $48$ cm Hence, the correct answer is 48 cm.
Question : The following sentence has been divided into parts. One of them may contain an error. Select the part that contains the error from the given options. If you don't find any error, mark 'No error' as your answer.
The team dwelt with / their performance / in the last quarter.
Option 1: their performance
Option 2: in the last quarter.
Option 3: No error
Option 4: The team dwelt with
Correct Answer: The team dwelt with
Solution : The fourth option is the correct choice.
The correct phrase should be, the team dealt with instead of dwelt with. Here, dwelt means to live in a certain place. However, in this context, the intended word should be dealt with,
Question : Which one of the following is not a non-conventional source of energy?
Option 1: Solar energy
Option 2: Natural gas
Option 3: Wind energy
Option 4: Tidal power
Correct Answer: Natural gas
Solution : The correct answer is Natural Gas.
Conventional sources of energy are non-renewable energy resources that have been used conventionally for a long time. They are generally limited by what is present in nature, and they will quickly run out if improperly employed. Examples
Question : Which of the following holy sites of Buddhism became a UNESCO World Heritage Site in 2002?
Option 1: Mahaparinirvana Temple at Kapilavastu.
Option 2: Buddhist Monuments at Sanchi.
Option 3: Dhamek Stupa at Sarnath.
Option 4: Mahabodhi Temple Complex at Bodh Gaya.
Correct Answer: Mahabodhi Temple Complex at Bodh Gaya.
Solution : The correct option is the Mahabodhi Temple Complex at Bodh Gaya.
The Mahabodhi Temple Complex at Bodh Gaya in Bihar is the holy site of Buddhism that became a UNESCO World Heritage Site in 2002. This site is particularly
Question : PA and PB are two tangents from a point P outside the circle with centre O at the points A and B on it. If $\angle A P B=130^{\circ}$, then $\angle O A B$ is equal to:
Option 1: 45°
Option 2: 50°
Option 3: 35°
Option 4: 65°
Correct Answer: 65°
Solution : Given: PA and PB are tangents $\angle OAP = 90^\circ $ $\angle OBP = 90^\circ $ As, OAPB is a quadrilateral $\angle OAP + \angle APB + \angle PBO + \angle BOA = 360^\circ $ ⇒ $90^\circ + 130^\circ + 90^\circ + \angle BOA =
Question : Directions: What should come in place of the question mark (?) in the given series? 48, 100, ?, 1232, 6170
Option 1: 306
Option 2: 280
Option 3: 304
Option 4: 214
Correct Answer: 306
Solution : Given: 48, 100, ?, 1232, 6170
In the given series, multiply the numbers with consecutive natural numbers from 2 onwards and add consecutive even numbers from 4 onwards to find the next term. (48 × 2) + 4 = 96 + 4 = 100; (100
Question : The circumference of the two circles is 198 cm and 352 cm, respectively. What is the difference between their radii?
Option 1: 45 cm
Option 2: 16.5 cm
Option 3: 49.5 cm
Option 4: 24.5 cm
Correct Answer: 24.5 cm
Solution : Given, The circumference of the two circles is 198 cm and 352 cm, respectively. Let the radii be $R$ and $r$, respectively. So, $2\pi R-2\pi r=352-198$ ⇒ $R-r= \frac{154\times7}{2\times 22}$ ⇒ $R-r=\frac{49}{4}$ $\therefore R-r=24.5$ cm Hence, the correct answer is 24.5 cm.
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