Maths Questions Series #5
The speed of the current is 5 km / hour. A motorboat goes 10 km upstream and back again to the starting point in 50 minutes. The speed (in km / hour) of the motorboat in still water is:
(A) 20
(B) 26
(C) 25
(D) 28
Correct Answer : C
A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of current are respectively.
(A) 4 kmph and 3 kmph
(B) 4.5 kmph and 0.5 kmph
(C) 4 kmph and 2 kmph
(D) 5 kmph and 2 kmph
Correct Answer : B
The LCM of two multiples of 12 is 1056. If one of the numbers is 132, the other number is
(A) 96
(B) 132
(C) 12
(D) 72
Correct Answer : A
When a number is divided by 15, 20 or 35, each time the remainder is 8. Then the smallest number is
(A) 328
(B) 338
(C) 428
(D) 427
Correct Answer : C
What will be the area (cm2) of the curved surface of an elliptical cylinder whose height and diameter are 10 cm and 8 cm respectively?
(A) 20 π
(B) 80 π
(C) 160 π
(D) 40 π
Correct Answer : B
If a cube whose side is 7.5 cm, what will be its volume?
(A) $$ {421.875\ cm^{3}}$$
(B) $$ {759.375\ cm^{3}}$$
(C) $$ {631.810\ cm^{3}}$$
(D) $$ {210.94\ cm^{3}}$$
Correct Answer : A
Which of the following is largest fraction amongst $$ {5\over8}$$, $$ {3\over7}$$, $$ {2\over9}$$, $$ {4\over5}$$?
(A) $$ {3\over7}$$
(B) $$ {5\over8}$$
(C) $$ {4\over5}$$
(D) None of these
Correct Answer : C
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