IIT JEE Practice Question and Answer
8Q: Which of the following animals have teeth in their stomach? 2267 05b5cc6bde4d2b4197774d8f7
5b5cc6bde4d2b4197774d8f7- 1Frogsfalse
- 2Crabstrue
- 3Snakesfalse
- 4Cockroachfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "Crabs"
Explanation :
Answer: B) Crabs Explanation:
Q: In one hour, a boat goes 12 km/hr along the stream and 6 km/hr against the stream. The speed of the boat in still water (in km/hr) is: 4441 05b5cc6bde4d2b4197774d8fc
5b5cc6bde4d2b4197774d8fc- 19true
- 28false
- 37false
- 47.5false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "9"
Explanation :
Answer: A) 9 Explanation: Speed in still water = Average of Speed in Upstream and speed in Downstream = 1/2 (12 + 6) kmph = 9 kmph.
Q: Directions: A string of words is fed into a computing machine. It processes the input and gives an output in the following manner: Input: Honesty is the best policy. Step 1: is Honesty the best policy Step 2: is the Honesty best policy Step 3: is the best Honesty policy Step 4: is the best policy Honesty Output: is the best policy Honesty Now, If the input is "A rolling stone gathers no moss", what will be the fifth word in the string after 4 steps? 3094 05b5cc6bde4d2b4197774d8f2
5b5cc6bde4d2b4197774d8f2- 1Mossfalse
- 2Nofalse
- 3Stonefalse
- 4Atrue
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "A"
Explanation :
Answer: D) A Explanation: For the input "A rolling stone gathers no moss", the steps followed are: Step 1: rolling A stone gathers no moss Step 2: rolling stone A gathers no moss Step 3: rolling stone gathers A no moss Step 4: rolling stone gathers no A moss After 4 steps the fifth word is "A".
Q: The milk and water in two vessels A and B are in the ratio 4:3 and 2:3 respectively. In what ratio the liquids in both the vessels be mixed to obtain a new mixture in vessel c consisting half milk and half water? 1696 05b5cc6bde4d2b4197774d8e8
5b5cc6bde4d2b4197774d8e8- 18:3false
- 26:7false
- 37:5true
- 411:7false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "7:5"
Explanation :
Answer: C) 7:5 Explanation: Milk in 1-litre mixture of A = 4/7 litre. Milk in 1-litre mixture of B = 2/5 litre. Milk in 1-litre mixture of C = 1/2 litre. By rule of alligation we have required ratio X:Y X : Y 4/7 2/5 \ / (Mean ratio) (1/2) / \ (1/2 – 2/5) : (4/7 – 1/2) 1/10 1/1 4 So Required ratio = X : Y = 1/10 : 1/14 = 7:5
Q: Rolling friction is caused by ____ from the following? 1663 05b5cc6bde4d2b4197774d8e3
5b5cc6bde4d2b4197774d8e3- 1Non-elastic effectstrue
- 2Gravityfalse
- 3Power dissipationfalse
- 4Buoyancyfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "Non-elastic effects"
Explanation :
Answer: A) Non-elastic effects Explanation: Rolling friction or rolling drag is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects, that is, not all the energy needed for deformation of the wheel, roadbed, etc... is recovered when the pressure is removed. Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.
Q: A person starting with 64 rupees and making 6 bets, wins three times and loses three times, the wins and loses occurring in random order. The chance for a win is equal to the chance for a loss. If each wager is for half the money remaining at the time of the bet, then the final result is: 4200 05b5cc6bde4d2b4197774d8de
5b5cc6bde4d2b4197774d8de- 1A gain of Rs. 27false
- 2A loss of Rs. 37true
- 3A loss of Rs. 27false
- 4A gain of Rs. 37false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "A loss of Rs. 37"
Explanation :
Answer: B) A loss of Rs. 37 Explanation: As the win leads to multiplying the amount by 1.5 and loss leads to multiplying the amount by 0.5, we will multiply the initial amount by 1.5 thrice and by 0.5 thrice (in any order). The overall resultant will remain same. So final amount with the person will be (in all cases): = 64(1.5)(1.5)(1.5)(0.5)(0.5)(0.5)= Rs. 27 Hence the final result is: 64 − 27 = 37 A loss of Rs.37
Q: How many more words can be formed by using the letters of the given word 'CREATIVITY'? 1435 05b5cc6bce4d2b4197774d8d9
5b5cc6bce4d2b4197774d8d9- 1851250false
- 2751210false
- 3362880false
- 4907200true
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "907200"
Explanation :
Answer: D) 907200 Explanation: The number of letters in the given word CREATIVITY = 10 Here T & I letters are repeated => Number of Words that can be formed from CREATIVITY = 10!/2!x2! = 3628800/4 = 907200
Q: The average age of husband, wife and their child 3 years ago was 24 years and that of wife and child 5 years ago was 25 years. The present age of the husband is: 1472 05b5cc6bce4d2b4197774d8d4
5b5cc6bce4d2b4197774d8d4- 121 yrstrue
- 227 yrsfalse
- 329 yrsfalse
- 431 yrsfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "21 yrs"
Explanation :
Answer: A) 21 yrs Explanation: Sum of ages of husband, wife and child= (24 × 3) + 9 = 81 years Sum of ages of wife and child => 25 × 2 + 10 = 50 + 10 = 60 years Age of husband = 81 - 60 = 21 years.