Which of the following in automobile exhaust can cause cancer?
Citizens of India can vote at the age of
The metals commonly used for electroplating are
Where is National Chemical Laboratory (NCL) located?
The historic Ellora Caves are located near
Pure water is bad conductor of electricity because it is
The process by which milk is converted to curd is called
Which of the following produces highest amount of energy upon oxidation?
The Industrial Revolution has led to
The most common cause of pollution of air is
In Ravi’s clock shop, two clocks were brought for repairs. One clock has the cuckoo coming out every sixteen minutes, while the other one has the cuckoo coming out every eighteen minutes. Both cuckoos come out at 12.00 noon. When will they both come out together again?

Solution
LCM of 16 minutes and 18 minutes
= 144 minutes = 2 hours 24 minutes
∴ Reqd. time = 2.24 PM
Ram sold a cow for ₹136 and thus lost 15%. At what price he should have sold it to gain 15%?

Solution
According to the question,
∴CP of the cow \(frac{100}{(10015)}times 36\)
= ^{20}⁄_{17} × 136 = Rs. 160
∴ Reqd. SP of the cow =\(frac{(100+ 15)}{100}times 160\)
\(=frac{23}{20}times 60= Rs 184\)
Mr and Mrs Gopal have 3 daughters and each daughter has one brother. How many persons are there in the family?

Solution
Total number of persons in the family
= 1 + 1 + 3 + 1 = 6
In the year 1996, the Republic day was celebrated on Friday. On which day was the Independence day celebrated in the year 2000 ?

Solution
From 26 January, 1996 to 15 August 2000,
number of days = (340 + 365 + 365 + 365 + 228) = 1663
Number of days in
1996 = 366  26 = 340 [.: 1996 is a leap yearJ
1997 = 365
1998 = 365
1999 = 365
2000 = [31 + 29 + 31 + 30 + 31 + 30 + 31 + 15] = 228
[∵ 2000 is a leap year, therefore we take 29 days in the month of February]
No. of odd days in 1663 days = 4
∴ on Tuesday the Independence day was celebrated in the year 2000.
If see 9 + cosec (90° – 9) = 4, (0 < θ < 90°), then the value of tan 9 is

Solution
∵ see θ + cosec (90°  θ) = 4 (0 < θ < 90°) ⇒ see θ + sec θ = 4 ⇒ sec θ = ^{4}⁄_{2} = 2 = sec 60° 2
⇒ θ = 60°
∴ tan θ = tan 60° = \(sqrt{3}\)
In a survey of a town, it was found that 65% of the people surveyed watch the news on’TV, 40% read a newspaper and 25% read a newspaper and watch the news on TV.What per cent of the people surveyed neither watch the news ‘on TV nor read a newspaper?

Solution
Rahul and Robin are brothers. Pramod is Robin’s father. Sheela is Pramod’s sister. Prema is Pramod’s niece. Shubha is Sheela’s grand daughter. How is Rahul related to Shubha ?

Solution
Who prepares the topographical maps of India?
If \(\overline{x}\) is the mean of n observations \(x_{1},x_{2},…..x_{n},\) then the mean of \(\frac{x_{1}}{a},\frac{x_{2}}{a}……..,\frac{x_{n}}{a}\) is

Solution
According to the question,
∵\(overline{x}\)
\(= mean of x_{1},x_{2}.....x_{n}\)\(=frac{x_{1} + x_{1} + x_{1} + + x_{n}}{n}\)
\(∴Mean: offrac{x_{1}}{a},frac{x_{2}}{a},frac{x_{3}}{x}....frac{x_{n}}{a}\)
\(=frac{1}{a}left ( frac{x_{1}+x_{2}+x_{3}+....+x_{n}}{n} right )=frac{overline{x}}{a}\)
Who among the following was not a physician?