The number of ways in which 52 cards can be divided into 4 sets, three of them having 17 cards each and the fourth one having just one card

1) $$\dfrac {52!}{(17!)^3}$$
2) $$\dfrac {52!}{(17!)^33!}$$
3) $$\dfrac {51!}{(17!)^3}$$
4) $$\dfrac {51!}{(17!)^33!}$$

 In both DNA and RNA, heterocylic base and phosphate ester linkages are at – 

A crystalline solid X reacts with dil.HCl to liberate a gas Y. Y decolourises acidified KMnO4?. When a gas Z is slowly passed into an aqueous solution of Y, colloidal sulfur is obtained. X and Z could be, respectively:

1) Na₂?SO_4??,H_2?S

2) Na₂?SO_4?,SO_2??

3) Na₂?S,SO₃  

4) Na₂?SO₃?,H_2??S

A monochromatic light of frequency $$v = \frac{1}{6.63} \times 10^{16}$$ Hz is produced by a laser. The power emitted is $$P = 10^{-2}$$ W. The average number of photos per second emitted by the source is

1) $$\frac{1}{(6.63)^2} \times 10^{16}$$
2) $$(6.63)^2 \times 10^{16}$$
3) $$10^{20}$$
4) $$10^{16}$$

Radius of the Earth were increased by a factor of 3 and its mass remained the same, then the acceleration due to gravity on the Earth would
 
 1) reduce by a factor of 3
 2) reduce by a factor of 9
 3) increase by a factor of 3
 4) increase by a factor of 9

Starting with three different amino acid molecules, how many different tripeptide molecules could be formed ?

1) 12
2) 9
3) 3
4) 6

In a binomial distribution consisting of 5 independent trials, the probability of 1 and 2 successes are 0.4096 and 0.2048 respectively. The parameter p of the distribution is

1) $$1/3$$
2) $$1/4$$
3) $$1/5$$
4) None of these

The number of points at which the function f(x )= | x- 0.5| + |x+1| + tanx does not have a derivative in interval (0, 2) is  

1) 1 
2) 2
3) 3
4) 4

Order and degree of $$x^{3}\dfrac{d^{3}y}{dx^{3}}+2x^{2}\dfrac{d^{2}y}{dx^{2}}+6y=x^{4}$$ are:

1) 3, 1
2) 1, 3
3) 3, 2
4) 2, 2

Which set has different class of compounds?

1) Tranquillisers-equanil, heroin, valium
2) Antiseptics-bithional, dettol, boric acid
3) Analgesics-naproxen, morphine, aspirin
4) Bactericidal-penicillin, aminoglycosides, ofloxacin