IIT JEE Practice Question and Answer
8Q: Fish and other aquatic creatures can live inside a deep frozen pond because 2685 05b5cc7b6e4d2b41977750905
5b5cc7b6e4d2b41977750905- 1fish are cold-blooded animalsfalse
- 2ice is a bad conductor of heatfalse
- 3there will always be water just beneath the ice leveltrue
- 4they can adapt themselves to live in icefalse
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Answer : 3. "there will always be water just beneath the ice level"
Explanation :
Answer: C) there will always be water just beneath the ice level Explanation: Water has the maximum density at 4oC. So at this temperature, it sinks down to bottom and stays here. If it cools further, it will become less dense and move up. So while the upper layers can cool enough to form ice, the bottom layers remain as water at 4oC . Therefore, (C) is correct.
Q: Formation of curd from milk is chemical reaction. 2682 05b5cc672e4d2b4197774c06f
5b5cc672e4d2b4197774c06f- 1TRUEtrue
- 2FALSE Answer & Explanation Answer:false
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Answer : 1. "TRUE"
Explanation :
Answer: A) TRUE Explanation: Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. It is biochemical change because here microorganism named lactobacillus react with milk and turn it to curd. Lactobacillus required favourable condition to grow. For it 37 degree temperature is needed. But sometimes when it does not get favourable condition, then other microorganism react and makes the curd taste different.
Q: Which of the following statements about ddntps is true? 2675 05b5cc688e4d2b4197774c350
5b5cc688e4d2b4197774c350- 1They have a hydrogen at the 3’ carbon of the sugar.true
- 2DNA polymerase can add a new dNTP to a 3’ ddNTP.false
- 3They have a free 3’-hydroxyl group on the ribose sugar.false
- 4They have an oxygen at the 2’ carbon of the ribose sugar.false
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Answer : 1. "They have a hydrogen at the 3’ carbon of the sugar."
Explanation :
Answer: A) They have a hydrogen at the 3’ carbon of the sugar. Explanation: ddNTPs - Dideoxynucleotides and abbreviated as ddNTPs. They are chain-elongating inhibitors of DNA polymerase, used in the Sanger method for DNA sequencing. They have a hydrogen at the 3’ carbon of the ribose sugar.
Q: Sound following a flash of lightning is called 2673 05b5cc67be4d2b4197774c1bd
5b5cc67be4d2b4197774c1bd- 1Stoningfalse
- 2Boltingfalse
- 3Thundertrue
- 4Cloud clashfalse
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Answer : 3. "Thunder"
Explanation :
Answer: C) Thunder Explanation: The Sound Following the flash of lighting is because of Thunder. Lightning is seen earlier than thunder because light travels much faster than sound. The roar of thunder is the result of a shock wave produced when lightning super-heats the air through which it passes, causing that air to expand very rapidly. This rapid expansion of air creates a shock wave that travels outward at close to the speed of sound.
Q: If the sides of a triangle are 26 cm, 24 cm and 10 cm, what is its area ? 2673 05b5cc6dce4d2b4197774e988
5b5cc6dce4d2b4197774e988- 1108 sq.cmfalse
- 2112 sq.cmfalse
- 3116 sq.cmfalse
- 4120 sq.cmtrue
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Answer : 4. "120 sq.cm"
Explanation :
Answer: D) 120 sq.cm Explanation: The triangle with sides 26 cm, 24 cm and 10 cm is right angled, where the hypotenuse is 26 cm. Area of the triangle =1/2 x base x height => 1/2 x 24 x 10 = 120 sq.cm
Q: A driver of auto rickshaw makes a profit of 20% on every trip when he carries 3 passengers and the price of petrol is Rs. 30 a litre. Find the % profit for the same journey if he goes for 4 passengers per trip and the price of petrol reduces to Rs. 24 litres ? 2671 05b5cc6fee4d2b4197774f157
5b5cc6fee4d2b4197774f157- 168%false
- 280%false
- 375%false
- 4100%true
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Answer : 4. "100%"
Explanation :
Answer: D) 100% Explanation: When 3 passengers income was 3xexpense= Rs.30 profit =20% of 30 = Rs.6 That means his earning is Rs.36. so that per passenger fare must be Rs.12. When 4 passengersearning = 12x4=Rs.48.expense =Rs.24.profit = Rs.24 = 100%
Q: A man pointing to a lady says, "Her brother is the father of my only son's sister." How is that lady related to the man ? 2668 05b5cc715e4d2b4197774f45e
5b5cc715e4d2b4197774f45e- 1sister of father-in-lawfalse
- 2daughter-in-lawfalse
- 3Sistertrue
- 4daughterfalse
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Answer : 3. "Sister"
Explanation :
Answer: C) Sister Explanation:
Q: Choose the pair which shows the same relation of the given pair from the following options ? BRISTLE : BRUSH 2667 05b5cc6eee4d2b4197774ef20
5b5cc6eee4d2b4197774ef20- 1arm : legfalse
- 2key : pianotrue
- 3recline : chairfalse
- 4stage : curtainfalse
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Answer : 2. "key : piano"
Explanation :
Answer: B) key : piano Explanation: A bristle is a part of a brush; a key is a part of a piano.