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Q:

Who is the First Test Tube Twins Babies in the World?

A) Louise Brown & Vesli Multinder	B) Stephan & Amanda
C) Harsha & Indhira	D) Elizabeth Car & Carl Wood

Answer & Explanation Answer: B) Stephan & Amanda

Explanation:

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Filed Under: World History

Q:

The smallest country of the world is

A) Italy	B) Vatican city
C) Brazil	D) Canada

Answer & Explanation Answer: B) Vatican city

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Filed Under: World Geography

Q:

The mean distance of the earth from the sun is approximately

A) 149,502,000 km	B) 150,503,000 km
C) 148,000,000 km	D) 150,000,000 km

Answer & Explanation Answer: A) 149,502,000 km

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Filed Under: World Geography

Q:

The highest average salinity amongst the following seas is reported from

A) Dead Sea	B) Red Sea
C) Black Sea	D) Migration Sea

Answer & Explanation Answer: A) Dead Sea

Explanation:

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Filed Under: World Geography

Q:

Which among the following migratory bird species migrates from Arctic to Antarctica every year, making it longest migratory route on nearth?

A) Arctic Tern	B) Black necked swan
C) Bobolink	D) American Robin

Answer & Explanation Answer: A) Arctic Tern

Explanation:

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Filed Under: World Geography

Q:

The Number of times the digit 8 will be written when listing the integers from 1 to 1000 is :

A) 100	B) 200
C) 300	D) 400

Answer & Explanation Answer: C) 300

Explanation:

Since 8 does not occur in 1000, we have to count the number of times 8 occurs when we list the integers from 1 to 999. Any number between 1 and 999 is of the form xyz, where $0 \leq x, y, z \leq 9 .$

Let us first count the numbers in which 8 occurs exactly once.

Since 8 can occur atone place in $3 C_{1}$ ways. There are $3 x 9 x 9$ such numbers.

Next, 8 can occur in exactly two places in $3 C_{2} \times 9$ such numbers. Lastly, 8 can occur in all three digits in one number only.

Hence, the number of times 8 occur is

$1 \times (3 \times 9^{2}) + 2 \times (3 \times 9) + 3 \times 1 = 300$

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Filed Under: Permutations and Combinations

Q:

The number of signals that can be generated by using 5 differently coloured flags, when any number of them may be hoisted at a time is:

A) 235	B) 253
C) 325	D) None of these

Answer & Explanation Answer: C) 325

Explanation:

Required number of signals = $5 P_{1} + 5 P_{2} + 5 P_{3} + 5 P_{4} + 5 P_{5}$

= 5 + 20 + 60 + 120 + 120 = 325

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Filed Under: Permutations and Combinations
Exam Prep: AIEEE , Bank Exams , CAT
Job Role: Bank Clerk , Bank PO

Q:

What is the total no of ways of selecting atleast one item from each of the two sets containing 6 different items each?

A) 2856	B) 3969
C) 480	D) None of these

Answer & Explanation Answer: B) 3969

Explanation:

We can select atleast one item from 6 different items = $2^{6} - 1$

Similarly we can select atleast one item from other set of 6 different items in $2^{6} - 1$ ways.

Required number of ways = $(2^{6} - 1) (2^{6} - 1) = {(2^{6} - 1)}^{2}$ = 3969

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Filed Under: Permutations and Combinations
Exam Prep: GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk

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