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Q:

The pH of pure water is nearly 7.It will increase on the addition of

A) ammonia B) cane sugar
C) common salt D) hydrochloric acid
 
Answer & Explanation Answer: A) ammonia

Explanation:

Ammonia is a base. One adding ammonia to water,the resulting solution will become basic. pH of an alkaline solution is 7. So the pH will increase

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Filed Under: Chemistry

Q:

The freezing point of water at 760mm pressure is

A) 0 K B) 273 K
C) 273 C D) -273 C
 
Answer & Explanation Answer: B) 273 K

Explanation:

K is degree kelvin

Zero K corresponds to -273  K = C + 273

The freezing point of water being 0 C, on the kelvin scale it is 0 C + 273 K

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Filed Under: Chemistry

Q:

The brain is covered by

A) meninges B) skin
C) bone D) all the above
 
Answer & Explanation Answer: D) all the above

Explanation:

The central nervous system ( brain and spinal card ) are invested with the meninges which nourish and protect the system .This again is enclosed inside a bony box which has the skin above it

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Filed Under: Biology

Q:

The artificial kidney is a

A) transplant B) machine
C) another's kidney D) other kidney from same body
 
Answer & Explanation Answer: B) machine

Explanation:

The artificial kidney is the dialysis machine. Blood from the body is fed into the machine which removes nitrogenous wastes like urea and returns the blood back to the body.People with renal failure have to use this machine.

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Filed Under: Biology

Q:

Blood is

A) alkaline B) neutral
C) like a buffer D) acidic
 
Answer & Explanation Answer: A) alkaline

Explanation:
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Filed Under: Biology

Q:

Light compensation zone refers to

A) where light is available in plenty B) where light is maximum
C) beyond which light does not penetrate D) where all light is used
 
Answer & Explanation Answer: C) beyond which light does not penetrate

Explanation:
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Filed Under: Biology

Q:

Plants growing in sunlight are called

A) sciophytes B) xerophytes
C) heliophytes D) hydrophytes
 
Answer & Explanation Answer: C) heliophytes

Explanation:
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Filed Under: Biology

Q:

Human Heart is made up of

A) nervous tissue B) cardiac muscle
C) nonstriated muscle D) connective tissue
 
Answer & Explanation Answer: B) cardiac muscle

Explanation:
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Filed Under: Biology