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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
Exam Prep: Bank Exams , AIEEE
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Q:

Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank ?

A) 15 min 20 sec. B) 16 min 40 sec.
C) 13 min 10 sec. D) 14 min 40 sec.
 
Answer & Explanation Answer: D) 14 min 40 sec.

Explanation:

Part filled in 4 minutes = 4(1/15 + 1/20) = 7/15

 

Remaining part = 1 - 7/15 = 8/15

 

Part filled by B in 1 minute = 1/20

 

1/20 : 8/15 :: 1 : k

 

k = (8/15 )x 1 x 20 = 10( 2/3) min = 10 min 40 sec.

 

The tank will be full in (4 min. + 10 min. 40 sec) = 14 min 40 sec.

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Filed Under: Pipes and Cistern
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Q:

The Mudumalai National Park is located in which state  ?

A) Chattisgarh B) Haryana
C) Tamil Nadu D) Karnataka
 
Answer & Explanation Answer: C) Tamil Nadu

Explanation:

The Mudumalai National Park (MNP) is located about 150 kilometres north-west of Coimbatore city in Tamil Nadu. The protected area is home to several endangered and vulnerable species including Indian elephant, Bengal tiger, gaur and Indian leopard. There are at least 266 species of birds in the sanctuary, including critically endangered Indian white-rumped vulture and long-billed vulture.

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Filed Under: General Science
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Q:

Which company briefly touched $800 billion market valuation, making it the world's first ever company to hit the milestone  ?

A) Google B) Microsoft
C) Facebook D) Apple
 
Answer & Explanation Answer: D) Apple

Explanation:

Apple briefly touched $800 billion market valuation, making it the world's first ever company to hit the milestone. At $800 billion, Apple's valuation was higher than the combined market cap of all the 30 Sensex companies, which stood at $784 billion. The world's most valuable company, Apple is followed by Google parent Alphabet, and Microsoft in market valuation.

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Filed Under: General Awareness

Q:

Two trains, one from Hyderabd to Bangalore and the other from Bangalore to Hyderabad, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds is  ?

A) 3 : 4 B) 4 : 3
C) 2 : 3 D) 3 : 2
 
Answer & Explanation Answer: B) 4 : 3

Explanation:

Let us name the trains as A and B.

Then, (A's speed) : (B's speed)

= √b : √a = √16 : √9 = 4:3

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Filed Under: Problems on Trains
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Q:

5% people of a village in India died by dengue, 15% of the remainder left the village on account of fear. If now the population is reduced to 3553, how much was it in the beginning ?

A) 4400 B) 3100
C) 2800 D) 5600
 
Answer & Explanation Answer: A) 4400

Explanation:

Let 'P' be the original population at the beginning

P x (95/100) x (85/100) = 3553

P = 4400.

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Filed Under: Percentage
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