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Question (31)

QN0015617

Which expression represents twice the product of a and b?

(A) a+b
(B) 2ab
(C) ab+2
(D) 2(a+b)

Correct Answer: B

Explanation:

Twice the product means 2 × a × b.

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Question (32)

QN0015618

A rectangle has length l and breadth b. The area is written as:

(A) l+b
(B) 2l+2b
(C) lb
(D) l−b

Correct Answer: C

Explanation:

Area = length × breadth = lb.

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Question (33)

QN0015619

If l = 8 and b = 5, find lb.

(A) 13
(B) 40
(C) 80
(D) 3

Correct Answer: B

Explanation:

8 × 5 = 40.

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Question (34)

QN0015620

The expression 4rs means:

(A) 4+r+s
(B) 4×r×s
(C) 4(r+s)
(D) r+s+4

Correct Answer: B

Explanation:

Adjacent symbols indicate multiplication.

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Question (35)

QN0015621

Evaluate 5mn when m = 4 and n = 6.

(A) 120
(B) 24
(C) 30
(D) 15

Correct Answer: A

Explanation:

5 × 4 × 6 = 120.

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Question (36)

QN0015622

Which expression correctly represents the cost of x notebooks at ₹12 each?

(A) 12+x
(B) 12x
(C) x+12
(D) 12÷x

Correct Answer: B

Explanation:

Cost = 12 × x = 12x.

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Question (37)

QN0015623

The total cost of p pens at ₹8 each and q pencils at ₹3 each is:

(A) 8p+3q
(B) 11pq
(C) 8pq+3
(D) 24pq

Correct Answer: A

Explanation:

Total cost = cost of pens + cost of pencils.

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Question (38)

QN0015624

Which expression represents the volume of a cuboid with dimensions l, b and h?

(A) l+b+h
(B) lbh
(C) 2(l+b+h)
(D) lh+b

Correct Answer: B

Explanation:

Volume = l × b × h = lbh.

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Question (39)

QN0015625

Why is the multiplication symbol omitted in algebraic expressions?

(A) To make expressions shorter and easier to read
(B) To change the value
(C) To avoid multiplication
(D) To create equations

Correct Answer: A

Explanation:

Omission makes algebraic expressions concise.

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Question (40)

QN0015626

Which algebraic expression correctly represents "three times a number n increased by four"?

(A) 3n+4
(B) 3(n+4)
(C) n+7
(D) 4n+3

Correct Answer: A

Explanation:

Three times n plus four is written as 3n + 4.

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Question (31)

Which expression represents twice the product of a and b?

Explanation:

Link:

Question (32)

A rectangle has length l and breadth b. The area is written as:

Explanation:

Link:

Question (33)

If l = 8 and b = 5, find lb.

Explanation:

Link:

Question (34)

The expression 4rs means:

Explanation:

Link:

Question (35)

Evaluate 5mn when m = 4 and n = 6.

Explanation:

Link:

Question (36)

Which expression correctly represents the cost of x notebooks at ₹12 each?

Explanation:

Link:

Question (37)

The total cost of p pens at ₹8 each and q pencils at ₹3 each is:

Explanation:

Link:

Question (38)

Which expression represents the volume of a cuboid with dimensions l, b and h?

Explanation:

Link:

Question (39)

Why is the multiplication symbol omitted in algebraic expressions?

Explanation:

Link:

Question (40)

Which algebraic expression correctly represents "three times a number n increased by four"?

Explanation:

Link:

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