IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: Who is the new Chairman of ISRO in 2018? 1267 05b5cc6b6e4d2b4197774d598
5b5cc6b6e4d2b4197774d598- 1K. Sivantrue
- 2S. Manish Aryafalse
- 3A.S. Kiran Kumarfalse
- 4Bibeth Royfalse
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उत्तर : 1. "K. Sivan"
व्याख्या :
Answer: A) K. Sivan Explanation: Rocket specialist K. Sivan has been appointed as new Chairman of India's space agency ISRO for a three-year term. He replaces current ISRO Chairman A.S. Kiran Kumar, whose term ends January 14, 2018. He is currently Director of Vikram Sarabhai Space Centre in Trivandrum. His expertise gave ISRO ability to send 104 satellites in a single mission.
प्र: A man has only 20-paise and 25-paise coins in a bag. If he has 50 coins in all totaling to Rs.10.25, then the number of 20-paise coins is 1260 05b5cc73ae4d2b4197774f8c4
5b5cc73ae4d2b4197774f8c4- 142false
- 245true
- 338false
- 436false
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उत्तर : 2. "45"
व्याख्या :
Answer: B) 45 Explanation: Let number of 20 ps coins = x and number of 25 ps coins = y Given total coins in the bag = 50 x + y = 50.......(1) But the total money in the bag = Rs. 10.25 0.20x + 0.25y = 10.25 20x + 25y = 1025.........(2) Now multiplying (1) by 25 we get 25x+25y=1250.............(3) By solving (2) and (3) 20x + 25y = 1025; => x = 45; Then, the no. of 20 ps coins are 45.
प्र: Find the area of the square whose side is equal to the diagonal of a rectangle of length 3 cm and breadth 4 cm. 1252 05b5cc698e4d2b4197774c66b
5b5cc698e4d2b4197774c66b- 125 sq.cmtrue
- 216 sq.cmfalse
- 39 sq.cmfalse
- 44 sq.cmfalse
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उत्तर : 1. "25 sq.cm"
व्याख्या :
Answer: A) 25 sq.cm Explanation: Given length of the rectangle = 3 cm Breadth of the rectangle = 4 cm Then, the diagonal of the rectangle D = 32 + 42 = 25 = 5 Then, it implies side of square = 5 cm We know that Area of square = S x S = 5 x 5 = 25 sq.cm.
प्र: I have three eyes but only one leg. I still close one even if you beg. What am I? 1240 05b5cc69de4d2b4197774c923
5b5cc69de4d2b4197774c923- उत्तर देखेंउत्तर छिपाएं
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उत्तर :
व्याख्या :
A traffic light. It has three 'eyes' (the red, orange and green lights) and the leg is the pole holding it up. Many people beg the light to stay green as they’re approaching.
प्र: What was the first book ever written? 1240 05b5cc69be4d2b4197774c7e8
5b5cc69be4d2b4197774c7e8- उत्तर देखेंउत्तर छिपाएं
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उत्तर :
व्याख्या :
The first written story that has come down to us is The Epic of Gilgamesh. It is a mythologized account of a historical figure, Gilgamesh, a ruler of the Sumerian city-state of Uruk, believed to have ruled sometime between 2700-2500 BC.
प्र: India's largest telecom operator Bharti Airtel announced a partnership with __________ to provide cyber security solutions to businesses in India. 1238 05b5cc6c9e4d2b4197774df97
5b5cc6c9e4d2b4197774df97- 1Symantec Corptrue
- 2Mimecastfalse
- 3Ciscofalse
- 4Raytheonfalse
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उत्तर : 1. "Symantec Corp"
व्याख्या :
Answer: A) Symantec Corp Explanation:
प्र: Brightness of bulb depends on voltage or current? 1235 05b5cc68be4d2b4197774c390
5b5cc68be4d2b4197774c390- 1Currentfalse
- 2Voltagefalse
- 3Both A & Btrue
- 4Nonefalse
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उत्तर : 3. "Both A & B"
व्याख्या :
Answer: C) Both A & B Explanation: Brightness of bulb depends on both voltage and current. The brightness depends on power. Since we know that Power (P) = Voltage x Current = V I So whether you increase the current or the voltage the brightness will increase. Example Illustration: If you connect a long bulb and a round bulb in series, the long bulb glows but the round bulb does not. Both of them have the same current flowing through them (they are in series) but the long bulb has a greater voltage across it because it has more resistance (even though V= IR is not obeyed exactly, voltage drop does depend on the resistance). If you connect a round bulb and a long bulb in parallel, however, it is the round bulb that is brighter because now the voltage across both bulbs is the same but the current is larger through the round bulb (smaller resistance). Hence, the brightness of a bulb depends on power i.e, both voltage and current.
प्र: What goes in the water black and comes out red 1230 05b5cc64ae4d2b4197774bbf7
5b5cc64ae4d2b4197774bbf7- उत्तर देखेंउत्तर छिपाएं
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उत्तर :
व्याख्या :
A Lobster is one which goes black in water and comes out red.

