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Q:

The elemental composition of an adult human body by mass is

A) C > O > H > N	B) O >C >H > O
C) N > C > O > H	D) None

Answer & Explanation Answer: B) O >C >H > O

Explanation:

O= 65%

C= 18%

H= 9.5%

N= 3.2%

Ca= 1.5%

Ph=1.2%

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Filed Under: General Science
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Q:

The radius of base of a right circular cone is 6cm and its slant height is 10cm. Then its volume is

$(u s e π = \frac{22}{7})$

A) 301.71 cm3	B) 310.71 cm3
C) 301.17 cm3	D) 310.17 cm3

Answer & Explanation Answer: A) 301.71 cm3

Explanation:

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Filed Under: Simplification
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Q:

In case of a standard hydrogen electrode

A) absolute electrode potential is not zero	B) absolute electrode potential is zero
C) both absolute and standard electrode potential values are zero	D) electrode potential is zero only at 25 deg C

Answer & Explanation Answer: A) absolute electrode potential is not zero

Explanation:

The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E0) is declared to be zero volts only at 298.

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Filed Under: Chemistry
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Q:

Ganesh, Ram and Sohan together can complete a work in 16 days. If Ganesh and Ram together can complete the same work in 24 days. The number of days Sohan alone takes, to finish the work is

A) 40	B) 48
C) 32	D) 30

Answer & Explanation Answer: B) 48

Explanation:

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Filed Under: Time and Work
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1 1166

Q:

If a.sin 45°.cos 45°.tan60° = tan 245° cos60° then find the value of a ?

A) 13	B) 3
C) 1	D) 32

Answer & Explanation Answer: A) 13

Explanation:

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Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero.	B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1.	D) Hydrogen can have more than one oxidation number.

Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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Filed Under: Chemistry
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Q:

The orthocentre of an obtuseangled triangle lies

A) inside the triangle	B) outside the triangle
C) on one side of a triangle	D) none of these

Answer & Explanation Answer: B) outside the triangle

Explanation:

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Q:

In a circle, two arcs of unequal length subtend angles in the ratio 5:3. If the smaller angle is 45° then the measure of other angle in degrees.

A) 75°	B) 72°
C) 60°	D) 78°

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