Exams Questions and Answers

Q:

Which solution is most concentrated?

A) 6 g of solute in 10 ml of solution	B) 20.5 g of solute in 50 ml of solution
C) 30 g of solute in 120 ml of solution	D) 2.6 g of solute in 2 ml of solution

Answer & Explanation Answer: D) 2.6 g of solute in 2 ml of solution

Explanation:

A concentrated solution will contain the most solute molecules per solvent molecules.

Here in the given options,

1) 6/10 = 0.6

2) 20.5/50 = 0.41

3) 30/120 = 0.25

4) 2.6/2 = 1.3

Hence, option D) is most concentrated.

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21 18473

Q:

A typist uses a sheet measuring 20cm by 30cm lengthwise.If a margin of 2 cm is left on each side and a 3 cm margin on top and bottom, then percent of the page used for typing is

A) 64%	B) 74%
C) 84%	D) 94%

Answer & Explanation Answer: A) 64%

Explanation:

Area of the sheet = $(20 \times 30) c m^{2}$

Area used for typing = $[(20 - 4) \times (30 - 6)] c m^{2}$

required % = $\frac{384}{600} \times 100$ =64%

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21 18465

Q:

Air pressure is usually highest when the air is

A) warm and moist	B) cool and dry
C) warm and dry	D) cool and moist

Answer & Explanation Answer: D) cool and moist

Explanation:

Both warmth and moisture reduce the density of air and hence its pressure is high.

Air_pressure_is_usually_highest_when_the_air_is1558073685.png image

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Filed Under: Physics
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90 18442

Q:

How many triangles are there in the given figure?

A) 14	B) 15
C) 17	D) 18

Answer & Explanation Answer: C) 17

Explanation:

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Filed Under: Image Analysis
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3 18439

Q:

In the following question, select the missing number from the given series.

19, 21, 25, 27, 31, ?

A) 35	B) 32
C) 33	D) 39

Answer & Explanation Answer: C) 33

Explanation:

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Filed Under: Number Series
Exam Prep: Bank Exams

3 18438

Q:

You can use the tab key to ________

A) move a cursor across the screen	B) indent a paragraph
C) move the cursor down the screen	D) both (a) and (b)

Answer & Explanation Answer: D) both (a) and (b)

Explanation:

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Filed Under: Computer
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59 18410

Q:

The length of a rectangle is twice its breadth. If its length is decreased by 5 cm and breadth is increased by 5 cm, the area of the rectangle is increased by 75 sq.cm. Find the length of the rectangle?

A) 10cm	B) 20cm
C) 30cm	D) 40cm

Answer & Explanation Answer: B) 20cm

Explanation:

Let the breadth of the given rectangle be x then length is 2x.
thus area of the given rect is $2 x^{2}$

after dec 5cm from length and inc 5cm breadth , new lenght becomes 2x-5 and breadth is x+5.thus new area =(2x-5)(x+5)= $2 x^{2} + 5 x - 25$

since new area is 75 units greater than original area thus
$2 x^{2} + 75 = 2 x + 5 x - 25$
5x=75+25
5x=100
therefore x=20
hence length of the rectangle is 40 cm.

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Filed Under: Area
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29 18408

Q:

Padma Shri - Dr Sundaram (S) Ramakrishnan passed away recently. What was his profession?

A) Scientist	B) Politician
C) Engineer	D) Doctor

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