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Parasitic fungi causing white rust on leaves of mustard is

a) Puccinia graminis tritici b) Ustilago hordei c) Albugo candida d) Saccharomyces cerevisiae Answer: c) Explanation: Albugo candida and its... View Article

Gill slits persist throughout the life in

a) Hemichordata b) Cephalochordata c) Urochordata d) All of the above Answer: b) Explanation: Cephalochordata is a subphylum of chordata... View Article

If CO2 is absent in atmosphere of earth then

a) Temperature will decrease b) Temperature will increase c) Plants will flourish well d) No effect Answer: a) Explanation: There is about... View Article

Verhulst-Pearl logistic growth is described by the equation dN/dt= rN [1-N/K], where ‘r’ and ‘K’ represent,

a) r= intrinsic rate of natural decrease, K= carrying capacity b) r= intrinsic rate of natural increase, K= carrying capacity c) r= extrinsic... View Article

Which of the following is a freshwater indicator organism?

a) Daphnia b) Tubifex c) Sludge worm d) All of the above. Answer: a) Explanation: Daphnias are small planktonic crustaceans, commonly known... View Article

Nucleic acid segment which is used to find the position of a gene and it forms a hybrid with this gene would be

a) Clone b) Vector c) Probe d) Retrovirus Answer: c) Explanation: A probe is a nucleotide sequence of varied lengths(from 100 to 10,000 bp)... View Article

The lining of intestinal wall from outside to inside is made up of

a) Longitudinal muscles → circular muscles → submucosa → mucosa b) Circular muscles → longitudinal muscles → submucosa → mucosa c) Mucosa →... View Article

Which of the following is a preservative part of plants?

a) Leaves b) Flower c) Seed d) All of the above Answer: d) Explanation: Seeds and leaves should be collected at the end of fall, after the... View Article

E.coli is used in the production of

a) Rifampicin b) LH c) Interferon d) Ecdysone Answer: c) Explanation: Interferons are a group of signalling molecules that are released from... View Article

What is the maximum number of action potential that a SAN can generate?

a) 20-30/min b) 70-75/min c) 40-60/min d) 50-60/min Answer: b) Explanation: The sino-atrial node(SAN) is a group of cells located in the... View Article

If x : y = 3:5, find the ratio 3x+4y:8x+5y

Solution: Let x = 3k and y = 5k 3x+4y:8x+5y = (9k+20k)/(24k+25k) = 29k/49k = 29/49 Hence the required ratio is 29:49.... View Article

Factors of 251

Solution: A prime number will have only 2 factors. It will be divisible by 1 and the same number. 251 is a prime number. The factors are 1 and 251.... View Article

Jane can type 60 words per minute and it takes her 35 minutes to write a letter. John can type 50 words per minute. How long would it take him to write the same letter?

Solution: Number of words Jane can type in one minute = 60 words She took 35 minutes to write a letter. So total number of words = 60×35... View Article

Find the value of x for which the equations f(x) = 3x² -1 and g(x) = 3 + x are equal.

Solution: Given f(x) = 3x2 -1 g(x) = 3 + x f(x) = g(x) => 3x2-1 = 3+x => 3x2-x-4 = 0 => x = (1±√(1+48))/6 =... View Article

The sum of all the prime factors of the number 1890 is _____

Solution: 1890 = 2×3×3×3×5×7 = 2×33×5×7 The prime factors are 2,3 5, and 7. Sum of the prime... View Article

Bisectors of interior ∠B and exterior ∠ACD of a ΔABC intersect at the point T. Prove that ∠BTC = ½ ∠BAC

Solution: ∠TBC = ½ ∠B ..(i) (Bisector of ∠B) ∠TCD = ½ ∠ACD ..(ii) In triangle ABC, ∠A+∠B = ∠ACD ..(iii)(exterior angle theorem) In triangle... View Article

Three consecutive integers are such that when they are taken in increasing order and multiplied by 2, 3 and 4 respectively, they add up to 74. Find these numbers.

Solution: Let the three consecutive integers be x-1, x, x+1. => 2(x-1) + 3x + 4(x+1) = 74 => 2x - 2 + 3x + 4x + 4 = 74 => 9x = 72... View Article

If sec a + tan a = x, then sec a =

(a) (x2+1)/2x (b) (x2+1)/x (c) (x2-1)/2x (d) (x2-1)/x Solution: Given sec a + tan a = x ..(i) Multiply and divide by (sec a - tan a) (sec... View Article

In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant approximately. What percentage of the selling price is the profit?

(a) 30% (b) 100% (c) 70% (d) 250% Solution: Let the cost price be Rs.100. Given that the profit is 320% of the cost. => profit = Rs.320... View Article

AIR Spotlight – Defence Preparedness of the Nation

AIR Spotlight is an insightful program featured daily on the All India Radio Newsonair. In this program, many eminent panellists discuss issues... View Article

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