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Q:

Brownish film formed on iron when left in open is called?

A) Dust B) Shovel
C) Spade D) Rust
 
Answer & Explanation Answer: D) Rust

Explanation:
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Filed Under: Chemistry
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Q:

Which of the following is a renewable resource of energy?

A) Hydrogen fuel B) Wind energy
C) Solar energy D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.

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Filed Under: Physics
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Q:

Which group in an ecosystem performs photosynthesis?

A) Xylotrophs B) Autotrophs
C) Monotrophs D) Heterotrophs
 
Answer & Explanation Answer: B) Autotrophs

Explanation:

In an ecosystem, Autotrophs performs photosynthesis. Autrophs are those prepare their own food.

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Filed Under: General Science
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Q:

Which one among the following stars is nearest to the earth?

A) Proxima Centauri B) Sirius
C) Arcturus D) Spica
 
Answer & Explanation Answer: A) Proxima Centauri

Explanation:

Proxima Centauri is the nearest star to the Earth.

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Q:

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.

The salesman tried to(A)/sell me a solar water heater(B)/but I already have one.(C)/No error(D)

 

A) A B) B
C) C D) D
 
Answer & Explanation Answer: D) D

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Filed Under: English
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Q:

What is the common characteristic of the elements of the same group in the periodic table?

A) Electrons in outer most shell B) Total number of electrons
C) Total number of protons D) Atomic weight
 
Answer & Explanation Answer: A) Electrons in outer most shell

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Filed Under: Chemistry
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Q:

Can You Guess The Missing Numbers In The Given Math Puzzle?

A) B)
C) D)
 
Answer & Explanation Answer: A)

Explanation:

Let the missing numbers be x, y, a and b

x + y = 8 ---- (1)
a - b = 6 ---- (2)
x + a = 13 --- (3)
y + b = 8 ---- (4)

2x + a + y = 21 --- From (1 & 3)
a + y = 14 ----  From (2 & 4)

Substitute (2 & 4) in (1 & 3)

2x + 14 = 21
2x = 7
x = 3.5

From (1) ---> 3.5 + y = 8
=> y = 8 - 3.5 = 4.5

a + y = 14 => a = 14 - y = 14 - 4.5 => a = 9.5
From (4) ---- y + b = 8 => b = 8 - y = 8 - 4.5 = 3.5

Hence,
x = 3.5
y = 4.5
a = 9.5
b = 3.5

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Filed Under: Math Puzzles
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Q:

Which city is the venue of the 9th International Conference on Micro Irrigation ?

A) Aurangabad B) Ahmedabad
C) Allahabad D) None of the above
 
Answer & Explanation Answer: A) Aurangabad

Explanation:
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