IIT JEE Practice Question and Answer
8Q: The length of a class room floor exceeds its breadth by 25 m. The area of the floor remains unchanged when the length is decreased by 10 m but the breadth is increased by 8 m. The area of the floor is 1771 05b5cc6b6e4d2b4197774d577
5b5cc6b6e4d2b4197774d577- 15100 sq.mtrue
- 24870 sq.mfalse
- 34987 sq.mfalse
- 44442 sq.mfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "5100 sq.m"
Explanation :
Answer: A) 5100 sq.m Explanation: Let the breadth of floor be 'b' m. Then, length of the floor is 'l = (b + 25)' Area of the rectangular floor = l x b = (b + 25) × b According to the question, (b + 15) (b + 8) = (b + 25) × b b2 + 8b + 15b + 120 = b2 + 25b 2b = 120 b = 60 m. l = b + 25 = 60 + 25 = 85 m. Area of the floor = 85 × 60 = 5100 sq.m.
Q: The area of a square is 1024 sq.cm. What is the ratio of the length to the breadth of a rectangle whose length is twice the side of the square and breadth is 12 cm less than the side of this square ? 1770 05b5cc72ce4d2b4197774f76e
5b5cc72ce4d2b4197774f76e- 114:9false
- 213:12false
- 316:5true
- 417:13false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "16:5"
Explanation :
Answer: C) 16:5 Explanation: Area of a square SxS = 1024 => S = 32 cmLength of the rectangle = 32x2 cm = 64 cmBreadth of the rectangle = 32 - 12 = 20 cmRequired ratio = 64 : 20 = 16 : 5
Q: Poor people have it. Rich people need it. If you eat it you die. What is it? 1770 05b5cc699e4d2b4197774c69b
5b5cc699e4d2b4197774c69b- 1Moneyfalse
- 2Brainfalse
- 3Luxury itemsfalse
- 4Nothingtrue
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 4. "Nothing"
Explanation :
Answer: D) Nothing Explanation: Poor people have Nothing Rich people need Nothing If you eat Nothing you die. Hence, it is Nothing.
Q: Which is the largest coal producing country in the World? 1769 05b5cc6b9e4d2b4197774d6fd
5b5cc6b9e4d2b4197774d6fd- 1Indiafalse
- 2Chinatrue
- 3Russiafalse
- 4New-zealandfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "China"
Explanation :
Answer: B) China Explanation: China has been by far the biggest coal producing country over the last three decades. The country produced about 3.6 billion tonnes (Bt) of coal in 2012 accounting for over 47% of the world's total coal output.
Q: What will come in the place of the (?) in the following number series ? 5 14 45 130 (?) 1182 1768 05b5cc6cae4d2b4197774e095
5b5cc6cae4d2b4197774e095- 1222false
- 2397true
- 3404false
- 4415false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "397"
Explanation :
Answer: B) 397 Explanation: The pattern of given series is : 5 14 = (5x3) - 1 45 = (14x3) + 3 130 = (45x3) - 5 (?) = (130x3) + 7 => (?) = 397 1182 = (397x3) - 9 Thus, the missing number is 397.
Q: In a box, there are four marbles of white color and five marbles of black color. Two marbles are chosen randomly. What is the probability that both are of the same color? 1767 05b5cc6a3e4d2b4197774cc15
5b5cc6a3e4d2b4197774cc15- 12/9false
- 25/9false
- 34/9true
- 40false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "4/9"
Explanation :
Answer: C) 4/9 Explanation: Number of white marbles = 4 Number of Black marbles = 5 Total number of marbles = 9 Number of ways, two marbles picked randomly = 9C2 Now, the required probability of picked marbles are to be of same color = 4C2/9C2 + 5C2/9C2 = 1/6 + 5/18 = 4/9.
Q: The amount of water vapor in the air is 1767 05b5cc6a6e4d2b4197774cdc0
5b5cc6a6e4d2b4197774cdc0- 1Hot airfalse
- 2Humiditytrue
- 3Dewfalse
- 4Foamfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "Humidity"
Explanation :
Answer: B) Humidity Explanation: The amount of water vapor ranges from a trace amount up to 4% of the mass of air. Water vapor exists as an invisible gas in the air. The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. The maximum amount of water vapor that can be in the air depends on the air temperature.
Q: Which online security campaign has been launched by Google India to safeguard internet users? 1767 05b5cc6aee4d2b4197774d17e
5b5cc6aee4d2b4197774d17e- 1#SecurityCheckKiyatrue
- 2#InternetSafetyKiyafalse
- 3#OnlineSecurityKiyafalse
- 4#SecureInternetKiyafalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "#SecurityCheckKiya"
Explanation :
Answer: A) #SecurityCheckKiya Explanation: Google has launched new online security campaign #SecurityCheckKiya in India to promote security awareness among general public. The purpose of the campaign is to protect young and first-time web users from account hijacking, safeguard Android devices from malicious apps and secure all their personal data if they lose their device.