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Question : What is used in storage batteries?
Option 1: Copper
Option 2: Tin
Option 3: Lead
Option 4: zinc
Correct Answer: Lead
Solution : The correct option is Lead.
Lead-acid batteries have a positive electrode of lead dioxide, a negative electrode of sponge lead, and an electrolyte of diluted sulfuric acid solution. During charging and discharging, the chemical processes in a lead-acid battery include the conversion of lead and
Question : The arithmetic mean of the following numbers 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7 is:
Option 1: 4
Option 2: 5
Option 3: 14
Option 4: 20
Correct Answer: 5
Solution : Arithmetic mean or average = $\frac{\text{Sum of the numbers}}{\text{Total count}}$ = $\frac{1+2+2+3+3+3+4+4+4+4+5+5+5+5+5+6+6+6+6+6+6+7+7+7+7+7+7+7}{28}$ = $\frac{1+2×2+3×3+4×4+5×5+6×6+7×7}{28}$ = $\frac{1+4+9+16+25+36+49}{28}$ = $\frac{140}{28}$ = $5$ Hence, the correct answer is 5.
Question : Rajiv Kumar assumed charge as the _______ Chief Election Commissioner of India in May 2022.
Option 1: 25th
Option 2: 20th
Option 3: 27th
Option 4: 23rd
Correct Answer: 25th
Solution : The correct option is the 25th.
Rajiv Kumar assumed charge as the 25th Chief Election Commissioner of India in May 2022. He is a retired Indian Administrative Service (IAS) officer of the 1984 batch.
Question : Directions: In the following question, some parts of the sentence may have some errors. Find out which part of the sentence has an error and select the appropriate option. If the sentence is free from error, select "No error".
The newspapers they admit that (1) / advertising sometimes (2) / influences their editorial policy. (3) / No error (4)
Option 1: (1)
Option 2: (2)
Option 3: (3)
Option 4: (4)
Correct Answer: (1)
Solution : The error lies in the first part of the sentence.
In the first part, the pronoun "they" is unnecessary and should be removed.
Therefore, the correct sentence is: The newspapers admit that advertising sometimes influences their editorial policy.
Question : If $x\left(5-\frac{2}{x}\right)=\frac{5}{x}$, then the value of $x^2+\frac{1}{x^2}$ is:
Option 1: $\frac{54}{25}$
Option 2: $\frac{53}{28}$
Option 3: $\frac{53}{27}$
Option 4: $\frac{54}{23}$
Correct Answer: $\frac{54}{25}$
Solution : Given: $x\left(5-\frac{2}{x}\right)=\frac{5}{x}$ ⇒ $5x-2 = \frac{5}{x}$ ⇒ $5x-\frac{5}{x} =2$ ⇒ $5(x-\frac{1}{x})=2$ ⇒ $x- \frac{1}{x} = \frac{2}{5}$ Squaring both sides. ⇒ $x^2+\frac{1}{x^2}-2 = \frac{4}{25}$ ⇒ $x^2+\frac{1}{x^2} = \frac{4}{25}+2$ ⇒ $x^2+\frac{1}{x^2} = \frac{54}{25}$ Hence, the correct answer is $\frac{54}{25}$.
Question : If the mass of an object is 60 kg, what will be its weight on the moon?
Option 1: 60 N
Option 2: 600 N
Option 3: 100 N
Option 4: 10 N
Correct Answer: 100 N
Solution :
Acceleration due to gravity on Earth ≈ 10m/s²
So the acceleration due
Question : If $0^{\circ}< \theta< 90^{\circ}$ and $\operatorname{cosec \theta} =\cot^{2}\theta$, then the value of expression $\operatorname{cosec^{4}\theta}–\operatorname{2cosec^{2}\theta}-\cot^{2}\theta$ is equal to:
Option 1: $2$
Option 2: $0$
Option 3: $1$
Option 4: $3$
Correct Answer: $0$
Solution : $\operatorname{cosec \theta} =\cot^{2}\theta$ $⇒\operatorname{cosec \theta} = \operatorname{cosec^2 \theta} -1$ Squaring both sides, we get, $⇒\operatorname{cosec^2 \theta} =\operatorname{cosec^4 \theta} -2\operatorname{cosec^2 \theta} +1$ $⇒\operatorname{cosec^4 \theta} -3\operatorname{cosec^2 \theta} +1=0$ $⇒\operatorname{cosec^4 \theta} -3\operatorname{cosec^2 \theta} +\operatorname{cosec^2 \theta} -\cot^2\theta =0$ [$\because1 = \operatorname{cosec^2 \theta}-\cot^2\theta$] $⇒\operatorname{cosec^4 \theta} -2\operatorname{cosec^2 \theta} -\cot^2\theta =0$ Hence,
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).
The parents could never guess what (the words meant) or who her dangerous teen idol was.
(1) the words mean
(2) the words moan
(3) the words explained
(4) No Improvement
Correct Answer: (4)
Solution : The correct choice is the fourth option.
The sentence conveys the idea that the parents were unable to figure out the meaning of certain words or phrases and were also unaware of who their daughter's dangerous teen idol was.
Therefore, there is no
Question : Select the most appropriate ANTONYM of the given word. Vicious
Option 1: Influential
Option 2: Gentle
Option 3: Privileged
Option 4: Poor
Correct Answer: Gentle
Solution : The most appropriate antonym is the second option.
Explanation: Vicious typically describes something aggressive, cruel, or having a harmful intent. Gentle is an appropriate antonym because it denotes qualities such as kindness, mildness, and a lack of aggression.
The meanings of the other options are
Question : Who among the following Chola rulers built the Nishumbhasudini Goddess temple in Thanjavur?
Option 1: Aditya I
Option 2: Vijayalaya
Option 3: Rajaraja I
Option 4: Arinjaya
Correct Answer: Vijayalaya
Solution : The correct answer is Vijayalaya.
Vijayalaya laid the foundation for the Chola dynasty. He made Tanjore his capital. After assuming the name Narakesari, Vijayalaya constructed the Nishumbhasudini Devi shrine. It is a Hindu temple built by Vijayalaya in the 9th century. Aditya I took
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