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Q:

How many seconds will a 600 m long train take to cross a man walking with a speed of 7 km/hr in the direction of the moving train if the speed of the train is 67 km/hr ?

A) 29 sec	B) 58 sec
C) 36 sec	D) 44 sec

Answer & Explanation Answer: C) 36 sec

Explanation:

Speed of train relative to man = 67 - 7 = 60 km/hr.
= 60 x 5/18 = 50/3 m/sec.

Time taken to pass the man = 600 x 3/50 = 36 sec.

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Filed Under: Problems on Trains
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Q:

After independence, the first state organized on the basis of language age is ?

A) Karnataka	B) Punjab
C) Gujarat	D) Andhra Pradesh

Answer & Explanation Answer: D) Andhra Pradesh

Explanation:

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Filed Under: Indian History
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Q:

If the C.I. on a sum for 2 years at 12 1/2 % per annum is Rs. 510, the S.I. on the same sum at the same rate for the same period of time is ?

A) Rs. 580	B) Rs. 480
C) Rs. 550	D) Rs. 470

Answer & Explanation Answer: B) Rs. 480

Explanation:

Let the sum be Rs. P. Then,

$[P {(1 + \frac{25}{2 x 100})}^{2} - P]$ = 510

P[ ${(\frac{9}{8})}^{2}$ - 1] = 510.

Sum = Rs. 1920

So, S.I. = (1920 x 25 x 2) / (2 x 100) = Rs. 480

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Filed Under: Simple Interest
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Q:

The first synthetic fibre made by man was ____ ?

A) Rayon	B) Terycott
C) Polyester	D) Nylon

Answer & Explanation Answer: D) Nylon

Explanation:

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Filed Under: General Science
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Q:

Brass gets discoloured in air because of the presence of which of the following gases in air ?

A) Hydrogen sulphide	B) Oxygen
C) Nitrogen	D) Carbon dioxide

Answer & Explanation Answer: A) Hydrogen sulphide

Explanation:

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Filed Under: Chemistry
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Q:

Train K crosses a pole in 30 seconds and train L crosses the same pole in one minute and 20 seconds. The length of train K is three-fourths the length of train L. What is the ratio of the speed of train K to that of train L ?

A) 1 : 3	B) 2 : 1
C) 3 : 1	D) 1 : 2

Answer & Explanation Answer: B) 2 : 1

Explanation:

Given that train K crosses a pole in 30 seconds and train L crosses the same pole in one minute and 15 seconds.

Let the length of train K be Lk and that of train L be Ll

given that Lk = 3/4 Ll

As the train K and L crosses the pole in 30 seconds and 80 seconds respectively,
=> Speed of train K = sk = Lk/30

Speed of train L = sl = Ll/80

Lk = 3/4 Ll
=> sk = 3/4 Ll/(30) = Ll/40

Ratio of their speeds = sk : sl
= Ll/40 : Ll/80

=> 1/40 : 1/80 = 2 : 1

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Filed Under: Problems on Trains
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Q:

The most populous city in the world is ?

A) Tokyo	B) Paris
C) Peking	D) London

Answer & Explanation Answer: A) Tokyo

Explanation:

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Filed Under: Famous Places
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Q:

Which of the following is a non metal that remains liquid at room temperature ?

A) Chlorine	B) Phosphorous
C) Bromine	D) Helium

Answer & Explanation Answer: C) Bromine

Explanation:

The chemical element with the atomic number 35, Bromine is a non metal that remains liquid at room temperature. Mercury also remains liquid at room temperature but it is a metal. Bromine is the third lightest halogen.

Which_of_the_following_is_a_non_metal_that_remains_liquid_at_room_temperature1542256555.jpg image

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Filed Under: Chemistry
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