GATE प्रश्न और उत्तर का अभ्यास करें
8प्र: The mean of 100 observations is 40. It is found that an observation 84 was misread as 48. Then the correct mean is ? 1814 05b5cc6c0e4d2b4197774dab2
5b5cc6c0e4d2b4197774dab2- 140.36true
- 241.24false
- 341.92false
- 442.05false
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उत्तर : 1. "40.36"
व्याख्या :
Answer: A) 40.36 Explanation: Given, mean of 100 observations is 40 => Total of 100 observations = 40 x 100 = 4000 84 is misread as 48 => Difference = 84 - 48 = 36 => Now, new total of 100 observations = 4000 + 36 = 4036 Correct Mean = 4036/100 = 40.36
प्र: How many 4-letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS', if repetition of letters is not allowed ? 1814 05b5cc731e4d2b4197774f805
5b5cc731e4d2b4197774f805- 15040true
- 22525false
- 32052false
- 44521false
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उत्तर : 1. "5040"
व्याख्या :
Answer: A) 5040 Explanation: The Word LOGARITHMS contains 10 letters. To find how many 4 letter words we can form from that = P410 =10x9x8x7 = 5040.
प्र: Atmospheric pressure exerted on earth is due to 1814 05b5cc651e4d2b4197774bd28
5b5cc651e4d2b4197774bd28- 1gravitational pulltrue
- 2rotation of earthfalse
- 3revolution of earthfalse
- 4uneven heating of earthfalse
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उत्तर : 1. "gravitational pull"
व्याख्या :
Answer: A) gravitational pull Explanation: The atmospheric pressure at the surface of the Earth is due to gravitational pull of the earth and is about 14.7 psi. That means that the weight of a column of air which has a cross section of 1 square inch and which stretches from the surface of the Earth to space is 14.7 pounds.
प्र: Cobalt 60 is used for cancer treatment it emmits which rays? 1814 05b5cc697e4d2b4197774c5c5
5b5cc697e4d2b4197774c5c5- 1Alphafalse
- 2Betafalse
- 3Gammatrue
- 4X raysfalse
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उत्तर : 3. "Gamma"
व्याख्या :
Answer: C) Gamma Explanation: Cobalt therapy or cobalt-60 therapy is the medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer. Cobalt 60 is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. It is produced artificially in nuclear reactors.
प्र: In general, which is the cause of a sea breeze? 1813 05b5cc636e4d2b4197774ba34
5b5cc636e4d2b4197774ba34- 1Pressurefalse
- 2Specific heattrue
- 3Heatfalse
- 4All the abovefalse
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उत्तर : 2. "Specific heat"
व्याख्या :
Answer: B) Specific heat Explanation: The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water. What is the cause of a sea breeze? The air over the land is warmed and rises, to a greater temperature than that over the sea. This produces a convection current, with cooler air flowing in from over the sea to replace that rising from the land. At night the land cools more than the sea, so the action reverses to produce a land-breeze, blowing off the land.
प्र: In the question below consists of a question and two statements numbered a and b given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give the answer. Question: In which year was Kalyan born ?Statements:a. Kalyan at present is 15 years younger to his mother.b. Kalyan's brother, who was born in 1991, is 25 years younger to his mother. 1813 05b5cc76ae4d2b4197774fe66
5b5cc76ae4d2b4197774fe66- 1b alone is sufficient while a alone is not sufficientfalse
- 2a alone is sufficient while b alone is not sufficientfalse
- 3Both a and b are sufficienttrue
- 4Neither a nor b is sufficientfalse
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उत्तर : 3. "Both a and b are sufficient"
व्याख्या :
Answer: C) Both a and b are sufficient Explanation: From both a and b, we find that Kalyan is (25 - 15) = 10 years older than his brother, who was born in 1991. So, Kalyan was born in 1981.
प्र: Can yoy guess the Age of Karthik & Kalyan ? 1813 05b5cc6d2e4d2b4197774e476
5b5cc6d2e4d2b4197774e476- 168 & 44false
- 264 & 48true
- 358 & 54false
- 476 & 36false
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उत्तर : 2. "64 & 48"
व्याख्या :
Answer: B) 64 & 48 Explanation: Given Karthik + Kalyan = 112 Given that when karthik is at the age of kalyan he is twice of Kalyan's age i.e When he was 48 means Kalyan is at 24 => Present age of Kalyan is 48 And that of Karthik is 112 - 48 = 64
प्र: In a bag, there are 8 red, 7 blue and 6 green flowers. One of the flower is picked up randomly. What is the probability that it is neither red nor green ? 1813 05b5cc774e4d2b41977750016
5b5cc774e4d2b41977750016- 113true
- 2821false
- 3621false
- 42021false
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उत्तर : 1. "13"
व्याख्या :
Answer: A) Option A Explanation: Total number of flowers = (8+7+6) = 21. Let E = event that the flower drawn is neither red nor green. = event taht the flower drawn is blue. --> n(E)= 7 --> P(E)= 721=13