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Q:

What is the next number in this series ? 

4, 6, 12, 18, 30, 42, 60, ?

A) 71 B) 72
C) 73 D) 69
 
Answer & Explanation Answer: B) 72

Explanation:

With close observation, you will note that each number in the list is in the middle of two prime numbers. Thus:

4 is in the middle of 3 and 5, 6 is in the middle of 5 and 7, 12 is in the middle of 11 and 13, 18 is in the middle of 17 and 19, 30 is in the middle of 29 and 31. 42 is in the middle of 41 and 43, 60 is in the middle of 59 and 61.

Therefore, the next number would be the one that is in the middle of the next two prime numbers, which is 72 (which is in the middle of 71 and 73).

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Filed Under: Odd Man Out
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10 92030
Q:

A computer cannot "boot" if it does not have the _____

A) Compiler B) Loader
C) Operating system D) Assembler
 
Answer & Explanation Answer: C) Operating system

Explanation:

An operating system is the system software that handles the software and hardware resources and provides services for the computer programs. SO without an operating system, a computer cannot "boot".

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Filed Under: Computer
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563 91702
Q:

Which are two chemicals used to purify water?

A) Chlorine & Fluorine B) Fluorine & Iodine
C) Chlorine & Hydrogen peroxide D) Fluorine & Iodine
 
Answer & Explanation Answer: C) Chlorine & Hydrogen peroxide

Explanation:

Removing the contaminents if any in the water which causes harm to our health is involved in the purifying of water. 

 

This process involves chemicals. Chloramines, Hydrogen peroxide, Iodine are the chemicals which are used in purifying water.

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Filed Under: Chemistry
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1 91535
Q:

Choose the pure substance from the list below.

 

A) Sugar B) Lemonade
C) Air D) Sea water
 
Answer & Explanation Answer: A) Sugar

Explanation:
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Filed Under: Chemistry
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3 91526
Q:

Place these hydrocarbons in order of decreasing boiling point.

1. Paraffin

2. Octadecane

3. Hexane

4. Neohexane and

5. Ethane

A) Paraffin > Octadecane > Neohexane > Hexane > Ethane B) Paraffin > Octadecane > Hexane > Neohexane > Ethane
C) Hexane > Paraffin > Octadecane > Neohexane > Ethane D) None of the above
 
Answer & Explanation Answer: B) Paraffin > Octadecane > Hexane > Neohexane > Ethane

Explanation:

In hydrocarbon, the boiling point directly varies with the length of carbon chain. On increasing the number of carbon atom, the boiling point of the compound also increases. Paraffin contains highest number of carbon atoms whereas, ethane is comprised of two carbon atoms.

 

The decreasing order of boiling point of mention compounds is written as follows:

Paraffin > Octadecane > Hexane > Neohexane > Ethane

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Filed Under: Chemistry
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10 91206
Q:

Select the four statements about Plasmodium that are true.

 

A)  Inside an infected mosquito, haploid gametes fuse, forming a diploid zygote that develops into an oocyst

B) Plasmodium cells infect two specific types of cells in humans.

C) Inside an infected mosquito, haploid gametes fuse, forming a haploid zygote that develops into an oocyst.

D) When a mosquito bites a human with malaria, diploid Plasmodium cells enter the mosquito.

E) Plasmodium cells are transferred to humans through mosquito saliva.

F) The life cycle of Plasmodium involves only haploid forms.

G) The complete life cycle of Plasmodium requires two hosts.

A) A, B, E, G B) A, C, F, G
C) B, C, D, F D) None of the above
 
Answer & Explanation Answer: A) A, B, E, G

Explanation:

Plasmodium is a genus of unicellular eukaryotes that are obligate parasites of vertebrates and insects. 

From the above given options, A, B, E, G are TRUE regarding Plasmodium.

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Filed Under: General Science
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35 90077
Q:

The working principle of a washing machine is

A) reverse osmosis B) diffusion
C) centrifugation D) dialysis
 
Answer & Explanation Answer: C) centrifugation

Explanation:

The working principle of a washing machine is centrifugation.

 

The_working_principle_of_a_washing_machine_is1542349278.jpg image

 

Centrifugation is a separation process which uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture.

The washing machine consists of centrifuge for this purpose. A centrifuge is a piece of equipment that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis of spin that can be very strong.

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Filed Under: Physics
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689 89641
Q:

Simplify the following equation.

1943 + 1(2 + 13 + 11 + 14)

A) 43/19 B) 1
C) 38/19 D) None of these
 
Answer & Explanation Answer: D) None of these

Explanation:

After solving we get,

 

62/931.

 

None of the options satisfy.

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Filed Under: Simplification
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23 89414