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Answer

B

Answer

The answer is B due to wrong design of the thermometer...  

Answer

Speed(S) = Distance(D)/Time(T)

speed of the light, S =  3 * 10 ^ (8)  m/s

nucleus of diameter, D = 1.56 * 10 ^ (-16) m

according to the formula,

S = D/T

T = D/S

T = (1.56 * 10 ^ (-16)) / (3 * 10 ^(8)) = 5.2 * 10 ^ (-25) s

So, the time taken by the light to pass through the nucleus will be 5.2 * 10 ^ (-25) sec.

Answer

10/14 = 5/7

Answer

according to pythagoras theorem,

a^2 + b^2 = c^2

where a and b are sides adjacent to right angle and c is the hypotenuse

3^2 + 4^2 = c^2

c^2 = 9+16

c^2 = 25

c = 5

as per diagram, c is the shortest distance from the starting point to the destination. So the answer is 5km.

Answer

So Total Men = 3x & Total Women = 2x

Total Population = 5x

Total graduates

Male = 20% & Female =: 25%

So total Non-graduates

Male = 80% & Female = 75%

Total Non Graduate :

Male = 3x * 80% = 3x * 4/5 = 12/5x

Female = 2x * 75% = 2x * 3/4 = 3/2x

Total Non Graduate = 12/5x + 3/2x = ((24+15)x)/10 = 39/10x = 3.9x

% of Non-graduate people = (total non-graduate/total population) * 100 = (3.9x/5x)*100 = 390/5 = 78%

So, total non-graduates are 78% of total population i.e Option D

Answer

Let, the marks obtained in Physics = a, Chemistry = b and mathematics = c

then, a + b + c = 120 + b

         a + c = 120

Average of a & c will be (a+c)/2 = 120/2 = 60

Average marks obtained by him in Physics and Mathematics thus will be 60.

Answer

20% water in 25kg mixture => 20/100 * 25 = 5kg of water

Lets add x litre of water to make it 33.33% i.e. 33.33/100

(5+x) / (25+x) = 33.33/100

(5+x) / (25+x) = 1/3

3(5+x) = (25+x)

15+3x = 25+x

3x-x = 25-15

2x = 10

x = 5

We will have to add 5 litre of water

Answer

Total = 5000

After 1 yr,

Total = 5000 + 2% of 5000 = 5000 + (2/100)*5000 = 5000+100 = 5100

After 1 more yr,

Total = 5100 + 2% of 5100 = 5100 + (2/100)*5100 = 5100+102 = 5202  

Means the answer is C

Answer

let the age of father be x and son be y.

Four years ago ratio of Father to Son :

x-4:y-4 = 19:6

x-y = 26 x=26+y ------------------(1)

we need to find, x:y

x-4/y-4 = 19/6 6(x-4)=19(y-4) 6x-24=19y-76 19y-6x=76-24 19y-6x=52

putting the value of x from (1),

19y-6(26+y)=52 19y-156-6y=52 13y=52+156 13y=208 y=16

putting the value of y in (1), x=26+16=42

Ratio of their present ages i.e. x:y is 42:16 = 21:8 so the answer is A