Find the odd man out: 1. 4, 9, 16. 20, 36, 49

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Find the odd man out:
1. 4, 9, 16. 20, 36, 49

A1

B9

C20

D49

Nithin K ? Apr 19 '2018 at 21:19

Correct Answer: C [20]

Explanation:

Remaining numbers are squares of 1,2,3,4,6,7

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Which matter is used In storage batteries?

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Which matter is used In storage batteries?

ACopper

BLead

CAlluminium

DZinc

Nithin K ? Apr 19 '2018 at 19:10

Correct Answer: B [Lead] 

Explanation:

lead. …is in the manufacture of storage batteries. It is used in ammunition (shot and bullets) and as a constituent of solder, type metal, bearing alloys, fusible alloys, and pewter.

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The chemical name of table salt

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The chemical name of table salt

Apotassium chloride

Bsodium chloride

Ccalcium chloride

D sodium hyposulphate

Nithin K ? Apr 18 '2018 at 7:16

Correct Answer: B [sodium chloride]

Explanation:

The Chemical name of table salt  Sodium Chloride (NaCl).

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100 * 10 - 100+2000 / 100 =?

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$$100 \times 10 - 100+ \frac{2000}{100} =?$$

A29

B780

C920

D979

Nithin K ? Apr 18 '2018 at 7:9

Correct Answer: C [920]

Explanation:

$100 \times 10 - 100+ \frac{2000}{100} =?$

According to BODMAS Rule,

$100 \times 10 - 100+ 20 =?$

$1000 - 100+ 20 =?$

$1000 - 120 =?$

= 920

Note: 

BODMAS Rule is

Step 1: Parts of the expression enclosed in ‘Brackets’ must be solved first. Inside the brackets, once again BODMAS rules apply! Just like a Russian Doll!

Step  2: The mathematical operators ‘of’ and ‘order’ must be solved next. ‘Of’ means part of and is solved by substituting with a multiplication sign. ‘Order’ is the same as exponent. Powers are solved after brackets. Powers also include roots.

Step 3: Next, the parts of the equation that contain ‘Division’ and ‘Multiplication’ are calculated.

Step 4: Last but not least, the parts of the equation that contain ‘Addition’ and ‘Subtraction’ should be calculated.

 

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Who invented the doctors thermometer?

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Who invented the doctors thermometer?

AFahrenheit

BEdIson

CGalileo

DNone of these

Nithin K ? Apr 18 '2018 at 6:53

Correct Answer: A [Fahrenheit]

Explanation:

In 1714 Dutch scientist and inventor Daniel Gabriel Fahrenheit invented the first reliable thermometer, using mercury instead of alcohol and water mixtures. In 1724 he proposed a temperature scale which now (slightly adjusted) bears his name.

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138.009 + 341.981 - 146.305 = 123.6 +?

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138.009 + 341.981 - 146.305 = 123.6 +?

A120.085

B120.85

C220.085

D None of these

Nithin K ? Apr 17 '2018 at 21:30

Correct Answer: D [ None of these]

Explanation:

123.6 + ?

= 138.009 + 341.981 - 146.305

=> 123.6 +? = 479.99 - 146.305

=> 123.6 + ? = 333.685

? = 333. 685 - 123.6 = 210.085

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If (x:y)=2: 1,then(x^2-y^2): (x^2+ y^2) is

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$$If (x:y)=2: 1,then(x^2-y^2): (x^2+ y^2) is:$$

A3:5

B5:3

C1:3

D3:1

Nithin K ? Apr 17 '2018 at 21:20

Correct Answer: 3:5

Explanation:

$\frac{x}{y}=\frac{2}{1} \text{ (Given)}$

$\text{Expression} = \frac{x^2-y^2}{x^2+y^2} = \frac{\frac{x^2}{y^2}-1}{\frac{x^2}{y^2}+1}$

$=\frac{(\frac{2}{1})^2-1}{(\frac{2}{1})^2+1}= \frac{4-1}{4+1}=\frac{3}{5}$

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