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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:

What gets wetter and wetter the more it dries?

A) Soap	B) Towel
C) Clothes	D) Sponge

Answer & Explanation Answer: B) Towel

Explanation:

Towel gets wetter and wetter the more it dries because we use that towel which is dried after used.

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Filed Under: Logic Puzzles
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Q:

What is $7 + 7 \div 7 + 7 \times 7 - 7 =$

A) 0	B) 42
C) 50	D) 57

Answer & Explanation Answer: C) 50

Explanation:

Given 7 + 7/7 + 7 x 7 - 7

By using BODMAS rule,

7 + 1 + 7 x 7 - 7

= 8 + 49 - 7

= 57 - 7

= 50.

Hence 7 + 7/7 + 7 x 7 - 7 = 50.

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Filed Under: Mathematical Operations
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Q:

$L i_{3} P O_{4}$ compound name?

A) Lithium perchlorate	B) Lithium phyrite
C) Lithium phosphate	D) None

Answer & Explanation Answer: C) Lithium phosphate

Explanation:

The given compund ${Li}_{3} {PO}_{4}$ name is Lithium phosphate.

Lithium phosphate is a white crystal at room temperature. It is slightly soluble in water.

It can be used to produce glass, disk, colorful phosphor powder. It can also be used as a catalyst in some reactions.

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Filed Under: Chemistry
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Q:

The oxidation number of Cr in $K_{2} {Cr}_{2} O_{7}$ is

A) +6	B) -5
C) +3	D) -4

Answer & Explanation Answer: A) +6

Explanation:

We will rewrite the formula as an equation.

2K + 2Cr + 7O = 0

The zero comes from there being no overall charge on the compound.

Each oxidation number is represented by the element's symbol.

Since this compound is not a peroxide or superoxide, the oxidation value for O is -2

K being in group 1 has a +1 charge and therefore has an oxidation number of K is +1

Now, by putting known values in we have:

2(+1) + 2(Cr) + 7(-2) = 0

2 + 2Cr -14 = 0

2Cr = +12

Cr = +6.

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Filed Under: Chemistry
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Q:

Simplify the following expression?

40% of ( $\frac{24}{4} x ?$ ) = 48

A) 24	B) 22
C) 20	D) 18

Answer & Explanation Answer: C) 20

Explanation:

We know that

$40 % = \frac{40}{100} = \frac{2}{5} \Rightarrow \frac{2}{5} x \frac{24}{4} x ? = 48 ? = \frac{48 x 5 x 4}{2 x 24} = 20$

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Filed Under: Simplification
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Q:

What is the systematic name of ${NH}_{4} {ClO}_{3}$ ?

A) Ammonium Chloride	B) Ammonium Chlorate
C) Ammonium Chlorane	D) Ammonium Chlorine

Answer & Explanation Answer: B) Ammonium Chlorate

Explanation:

In common we all call the systematic name of $N H_{4} C l O_{3}$ as Ammonium Chlorate. But originally the systematic name is azanium trioxidochlorate.

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Filed Under: Chemistry
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