MCQ

MCQ 11 Mark

The speed of $90 \ km/h$ is equal to

A
$10\ m/\sec$
B
$18\ m/\sec$
✓
$25\ m/\sec$
D
none of these

Answer

Correct option: C.

$25\ m/\sec$

Speed of $90 \ km/h =\frac{90 \times 5}{18}\text{ m/sec}$
$=25\ m/\sec$

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MCQ 21 Mark

Sonali bought one dozen notebooks for ₹ 66. What did she pay for one notebook?

A
₹ 6.50
B
₹ 6.60
C
₹ 5.60
D
₹ 5.50

Answer

Cost of 12 books = ₹ 66
Let cost of one book = x
12 : 1 = 66 : x
12 × x = 1 × 66
x = 5.5
Cost of 1 book = ₹ 5.50 (d)

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MCQ 31 Mark

If the weight of $5$ bags of sugar is $27 \ kg,$ then the weight of one bag of sugar is

A
$5.4 \ kg$
B
$5.2 \ kg$
✓
$5.4 \ kg$
D
$5.6 \ kg$

Answer

Correct option: C.

$5.4 \ kg$

Weight of $5$ bags of sugar $=27 \ kg$
Weight of one bag of sugar
$=5: 1:: 27: x$
$5 x=1 \times 27$
$x=\frac{27}{5}=5.4 \ kg$

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MCQ 41 Mark

If 3, 12 and x are in continued proportion, then x is

A
4
B
6
C
16
D
48

Answer

3, 12 and x are in continued proportion, then
3 : 12 :: 12 : x
3x = 12 × 12
x = 48 (d)

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MCQ 51 Mark

If x, 12, 8 and 32 are in proportion, then x is

Answer

x, 12, 8 and 32 are in proportion, then
x × 32 = 12 × 8
x = 3 ©

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MCQ 61 Mark

Two numbers are in the ratio 3 : 5. If the sum of the numbers is 144, then the largest number is

A
48
B
54
C
72
D
90

Answer

Ratio between two numbers $=3: 5$
Sum of numbers 144
Then larger number $=\frac{144}{3+5} \times 5$ $=\frac{144}{8} \times 5=90$ (d)

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MCQ 71 Mark

The ratio of number of girls to the number of boys in a class is 6 : 7. If there are 21 boys in the class, then the number of girls in the class is

A
39
B
24
C
18
D
13

Answer

Girls : boys = 6 : 7
No. of boys = 21
Let no. of girls = x
6 : 7 :: x : 21
7 × x = 6 × 21
x = 18
No. of boys = 18 ©

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MCQ 81 Mark

In a class of 35 students, the number of girls is 20. The ratio of number of boys to the number of girls in the class is

A
$3: 4$
B
$4: 3$
C
$7: 4$
D
$7: 3$

Answer

Total number of students $=35$
No. of girls $=20$
No. of boys $=35-20=15$
Ratio in boys and girls $=15: 20=3: 4$ (a)

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MCQ 91 Mark

The ratio of the number of sides of a rectangle to the number of edges of a cuboid is

A
$1: 2$
B
$1: 3$
C
$2: 3$
D
none of these

Answer

Ratio of number of sides of a rectangle to the number of edges of a cuboid $=4: 12=1: 3$ (b)

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MCQ 101 Mark

The ratio of $75\ mL$ to $3$ litres is

A
$25: 1$
B
$40: 1$
✓
$1: 40$
D
$3: 200$

Answer

Correct option: C.

$1: 40$

$75\ mL$ to $3$ litres
$=75: 3000$
$=1: 40$

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MCQ 111 Mark

A ratio equivalent to the ratio $\frac{2}{3}: \frac{3}{4}$ is

A
$4: 6$
✓
$8: 9$
C
$6: 8$
D
$9: 8$

Answer

Correct option: B.

$8: 9$

$\frac{2}{3}: \frac{3}{4}$
$\frac{8: 9}{12}$
$=8: 9$

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MCQ 121 Mark

A ratio equivalent to $6: 10$ is

A
$3: 4$
✓
$18: 30$
C
$12: 40$
D
$5: 3$

Answer

Correct option: B.

$18: 30$

$6: 10=3: 5$
$18: 30=3: 5$
$6: 40$ is equivalent to $18: 30$

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