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Q:

The percentage of metals in a mine of zinc ore is 60%. Now the percentage of silver is 3/4% of metals and the rest is zinc. If the mass of ore extracted from the mine is 8000 kg, the mass (in kg) of zinc is

A) 5147 kg B) 4764 kg
C) 3587 kg D) 2125 kg
 
Answer & Explanation Answer: B) 4764 kg

Explanation:

Mass of zinc ore = 8000 kg


Mass of metal = 60% of 8000 = 4800 kg


Mass of silver in metal = 3/4 x 4800/100 = 36 kg


Mass of zinc = 4800 - 36 = 4764 kg.

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Filed Under: Percentage
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Q:

Refractive Index of glass with respect to water is

A) 4/3 B) 9/8
C) 2/3 D) 8/9
 
Answer & Explanation Answer: D) 8/9

Explanation:

Refractive Index of glass with respect to water can be calculated by 

(Refractive Index of glass with respect to air) × (1/Refractive Index of water with respect to air)

 

We know that,

Refractive Index of glass with respect to air = 4/3

Refractive index of water with respect to air = 3/2

 

Hence, Refractive Index of glass with respect to water = (4/3) x (2/3) = 8/9.

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Filed Under: Physics
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Q:

445 of 229.79 = ? of 2398.51

A) 23/50 B) 36/49
C) 33/41 D) 29/47
 
Answer & Explanation Answer: A) 23/50

Explanation:

Given 

445 of 229.79 = ? of 2398.51

 

245 x 230 = ? x 240024 x 46 = ? x 2400? = 46/100 ? = 2350

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Filed Under: Percentage
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Q:

The Middle Ages in Western Europe was characterized by

A) absolute monarchies and strong central governments B) extensive trade with Asia and the Middle East
C) the manor system and the importance of land ownership D) decreased emphasis on religion in daily life
 
Answer & Explanation Answer: C) the manor system and the importance of land ownership

Explanation:
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Filed Under: World History
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Q:

A woman suffered 20% loss on first investment and made 10% profit at second investment and 12 ½% profit on the third investment. If the invested amount be in the ratio of 4 : 5 : 3, find her profit percentage?

A) 0.625% B) 1.205%
C) 0.987% D) 0%
 
Answer & Explanation Answer: A) 0.625%

Explanation:

From the given data,

let the amounts invested be 4p, 5p and 3p

Net profit = Total profit - Total loss

= 10x5p/100 + 25x3p/200 - 20x4p/100

= 0.875p - 0.8p

= 0.075p

Therefore, profit% = (Net profit/Total investment) x 100

= 0.075 x 100/12 

= 0.0625%

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Filed Under: Percentage
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Q:

Forces of attraction limit the motion of particles most in solids.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

We know that, solids have definite shapes and definite volumes, whereas liquids have definite volumes but indefinite shapes and coming to gases it has indefinite volumes and indefinite shapes.


 


Hence, only in solids, the forces of attraction limit the motion of particles.

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Subject: Physics
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Q:

The C shape of the tracheal cartilages is important because

A) divide the nasal cavity B) Allows for expansion or contraction of the trachea
C) provide a surface for the sense of smell D) All of the above
 
Answer & Explanation Answer: B) Allows for expansion or contraction of the trachea

Explanation:

Allows for expansion or contraction of the trachea. Hence, so large masses of food can pass through the esophagus during swallowing.

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Filed Under: Biology
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Q:

Which of the following is an example of social interaction?

A) Coercion B) Competition
C) Cooperation D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

All the above given options are the examples of social interaction. In sociology, interactions are of five types.They are :

1) Exchange

2) Competition

3) Cooperation

4) Coercion

5) Conflict

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Filed Under: Indian Politics
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