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Q:

Which of the following pairs is mismatched?

A) Hooke - cell theory	B) van Leeuwenhoek - germ theory
C) Lister - aseptic surgery	D) Jenner - vaccines

Answer & Explanation Answer: B) van Leeuwenhoek - germ theory

Explanation:

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Filed Under: Biology
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Q:

Which of the following is not a pure substance?

A) Oxygen	B) Carbon dioxide
C) Water	D) Milk

Answer & Explanation Answer: D) Milk

Explanation:

Milk is not a pure substance since it has so many constituents that can be separated physically.

Compounds are pure substances formed from elements unlike mixtures.

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Filed Under: Chemistry
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Q:

Which one of the following is not a prime number?

A) 91	B) 71
C) 41	D) 31

Answer & Explanation Answer: A) 91

Explanation:

Prime Numbers :: Numbers which are divisible by only 1 and itself are Prime Numbers.

It's answer will be 91.

Because 91 can be divisible by 7,13,91,1.

It is quite clear that prime number should be divisible only by itself and by 1.

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Filed Under: Problems on Numbers
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Q:

Which of the following is not a plantation crop?

A) rubber	B) coffee
C) gram	D) coconut

Answer & Explanation Answer: C) gram

Explanation:

Gram is not a Plantation crop among the given options.

Plantation crops are known as cash crops. These crops are mostly grown at tropical and subtropical areas. These crops are grown for sale but not for local consumption. such crops include rubber, coffee, tea, various oil seeds, sugar cane,etc.

So, Gram is not a plantation crop.

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Filed Under: Indian Geography
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Q:

Simplify the following :

$4 \frac{1}{5} \times 3 \frac{1}{3} + ? = 20 % of 120$

A) 10	B) 24
C) 36	D) 40

Answer & Explanation Answer: A) 10

Explanation:

Given equation can be written as

$\frac{21}{5} x \frac{10}{3} + ? = 24 = > 14 + ? = 24 = > ? = 24 - 14 = > ? = 10$

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Filed Under: Simplification
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Q:

Which of the following statements is most accurate regarding infection with parvovirus B19?

A) Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors	B) Parvovirus B19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
C) Parvovirus B19 can be diagnosed by detection of viral RNA using PCR or hybridization assays	D) Parvovirus B19 replicates in the host cell nucleus utilizing a virally encoded DNA polymerase to create a double- stranded DNA intermediate

Answer & Explanation Answer: A) Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors

Explanation:

Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors.

a. Parvovirus B19 binds preferentially to the erythrocyte blood group P antigen on erythroid precursor cells.

Answers B, C, D are incorrect:

b. after entry the single-stranded viral DNA genome is transported to the cell nucleus where the host DNA polymerase synthesizes the complimentary DNA strand.

c. Parvovirus B19 infection can be diagnosed by direct detection of viral DNA not RNA.

d. the fetus of a seropositive mother is protected from infection by maternal circulating antibodies.

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Filed Under: Biology
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Q:

Which Of The Following Statements Is Most Accurate For The Declaration X = Circle()?

A) x contains a reference to a Circle object	B) You can assign an int value to x
C) x contains an object of the Circle type	D) x contains an int value

Answer & Explanation Answer: A) x contains a reference to a Circle object

Explanation:

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Filed Under: Programming
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Q:

Which of the following is generally true about the stratosphere?

A) It is very dry	B) It is very moist
C) The dryness level varies with the season	D) The dryness level varies with the moon cycle

Answer & Explanation Answer: A) It is very dry

Explanation:

The stratosphere layer of the atmosphere is very dry.

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Filed Under: General Science
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