Q:

Which type of reaction occurs when carbon burns in oxygen to give carbo dioxide?

A) Addition reaction	B) Substition reaction
C) Combustion reaction	D) Decomposition reaction

Answer & Explanation Answer: C) Combustion reaction

Explanation:

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0 53421

Q:

Organs having different structure and components but perform similar functions are called ______.

A) Analogous organs	B) Homologous organs
C) Heterogeneous organs	D) Homogenous organs

Answer & Explanation Answer: A) Analogous organs

Explanation:

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1 53301

Q:

___ is the number of shells for elements of the 3rd period.

A) 1	B) 0
C) 2	D) 3

Answer & Explanation Answer: D) 3

Explanation:

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Q:

They come out at night without being called and are lost in the day without being stolen. What are they?

A) Light	B) Bats
C) Stars	D) Flights

Answer & Explanation Answer: C) Stars

Explanation:

Stars are what that come out at night without being called and are lost in the day without being stolen.

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175 53260

Q:

SI unit of equivalent conductance

A) ohm/cm	B) Siemens m2/equivalent
C) Siemens/equivalent	D) mho/cm

Answer & Explanation Answer: B) Siemens m2/equivalent

Explanation:

SI_unit_of_equivalent_conductance1556274980.jpg image

Equivalent conductance is defined as the conductance of an electrolyte solution containing one gram equivalent of the electrolyte. It is equal to the product of specific conductance (k) of the solution and the volume (V) of the solution that contains one gram equivalent of the electrolyte.

$λ$ = k x V

Unit of spceific conductance k is Siemens / m.

Volume of the solution V is $m^{3}$

Now, required equivalent conductance unit is $Siemens . m^{2} / equivalent$ .

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137 53220

Q:

Which group in the modern periodic table contains elements that are inert gases?

A) Group 16	B) Group 18
C) Group 17	D) Group 15

Answer & Explanation Answer: B) Group 18

Explanation:

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1 53211

Q:

Which among the following statements are TRUE regarding synthetic fibre?

I. They melt after catching fire.

II. They are more durable.

III. They are prepared by a number of processes using petrochemicals.

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: D) All I, II and III

Explanation:

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Q:

Which of the following statements about the reaction below are INCORRECT?

$2 Pb + C \to 2 Pb + {CO}_{2}$

A. Carbon di-oxide is getting, oxidised
B. Lead is getting reduced
C. Carbon is oxidised
D. Lead oxide is getting reduced

A) A and C	B) A and B
C) B and C	D) A, B and C

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