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Q:

Which compound contains both ionic and covalent bonds?

A) NaNO3 B) CaSO4
C) NH4Cl D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Here all the given compounds have both ionic and covalent bonds.

 

NaNO3 - In Sodium nitrate, Nitrate is covalently bonded as nitrogen is bonded with 3 oxygen atoms. And this nitrate is ionically bonded with sodium.

 

CaSO4 - In Calcium sulphate, sulphate is covalently bonded as sulphur is bonded with 4 oxygen atoms. And this sulphate is ionically bonded with calcium.

 

NH4Cl - In Ammonium chloride, ammonium is covalently bonded as nitrogen is bonded with 4 hydrogen atoms. And this ammonium is ionically bonded with chlorine.

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Q:

Select the synonym of

proscriptive

A) squalid B) exiguous
C) excessive D) thrifty
 
Answer & Explanation Answer: C) excessive

Explanation:
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Q:

Match the following with the correct response.

 

(1) W (A) Nm
(2) kW       (B) 3.6 x 106 J
(3) 1 kW-h (C) 1000 W
(4) 1 HP (D) 746 W

A) 1-D, 2-B, 3-C, 4-A B) 1-A, 2-B, 3-C, 4-D
C) 1-A, 2-C, 3-D, 4-B D) 1-A, 2-C, 3-B, 4-D
 
Answer & Explanation Answer: D) 1-A, 2-C, 3-B, 4-D

Explanation:
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Q:

Which element has similar properties to Beryllium?

A) Manganese B) Calcium
C) Both A & B D) Helium
 
Answer & Explanation Answer: B) Calcium

Explanation:

The elements in the same column will have similar properties. Beryllium is the group II element. Group II elements are magnesium, calcium, strontium, barium and radium. Hence, these show the similar prperties.

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Q:

Decibel is the unit of

A) speed of light B) intensity of sound
C) intensity of heat D) None of these
 
Answer & Explanation Answer: B) intensity of sound

Explanation:
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Q:

Computer software can be defined as

 

A) the interaction between the computer and its database B) an interface between the computer and the network
C) the computer and its associated equipment D) the instructions that tell the computer what to do
 
Answer & Explanation Answer: D) the instructions that tell the computer what to do

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Q:

India has donated a 'Digital cobalt therapy machine' developed by BARC, to which country?

 

 

A) Madagaskar B) Mali
C) Malaysia D) Maldives
 
Answer & Explanation Answer: A) Madagaskar

Explanation:
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Q:

Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K? 

A) K1k2/k1+k2 B) 2k1k2/k1+k2
C) K1+k2/k1k2 D) None
 
Answer & Explanation Answer: B) 2k1k2/k1+k2

Explanation:

We know that,

 

The equivalent K =  L1 + L2L1K1+L2K2

 

where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.

 

But here L1 = L2 = L (say)

 

Then K = L+L/(L/K1 + L/K2)  =  2K1K2K1+K2

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