IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: K is 50% faster than L. If L starts at 9 A.M. and K starts at 10 A.M. L travels at a speed of 50 km/hr. If L and K are 300 kms apart, The time when they meet when they travel in opposite direction is ? 2415 0

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    12 pm
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    1 pm
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    11 am
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  • 4
    11:30 am
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उत्तर : 1. "12 pm"
व्याख्या :

Answer: A) 12 pm Explanation: let 't' be the time after which they met since L starts. Given K is 50% faster than L 50 t + 1.5*50(t-1) = 300 50 t +75 t = 300 + 75 t = 375 / 125 = 3 hrs past the time that L starts So they meet at (9 + 3)hrs = 12:00 noon.

प्र: If x is a whole number, then x²(x² - 1) is always divisible by ? 2414 0

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    4
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    8
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    12
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    None
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उत्तर : 3. "12"
व्याख्या :

Answer: C) 12 Explanation: we can do this by trial and error method. Putting x = 2,we get 2²(2² - 1) = 12.checking with other integers, the above equation always gives a value which is a multiple of 12,So, x²(x² - 1) is always divisible by 12.

प्र: Assertion( 2413 0

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    : Most of the Himalayan rivers are perennial.Reason(R) : They are fed by melting snow. A) R correctly explains A
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    R is true but A is fale
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    A is true but R is false
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    A) R correctly explains A B) R is true but A is fale C) A is true but R is false D)
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उत्तर : 1. ": Most of the Himalayan rivers are perennial.Reason(R) : They are fed by melting snow. A) R correctly explains A"
व्याख्या :

Answer: A) R correctly explains A Explanation: Most Himalayan rivers are perennial because they are fed by the melting snow throughout the year.Thus, both A and R are true & R correctly explains A.

प्र: Is blood homogeneous or heterogeneous? 2412 0

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    Homogeneous
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    Heterogeneous
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    Both A & B
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    None of the above
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उत्तर : 2. "Heterogeneous"
व्याख्या :

Answer: B) Heterogeneous Explanation: Blood is a heterogeneous mixture because the blood cells are physically separate from the blood plasma. The cells have different properties than the plasma. The cells can be separated from the plasma by centrifuging, which is a physical change.

प्र: The longest period of prenatal development is the 2412 0

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    Germinal period
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    Fetal period
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    Embryonic period
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    None
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उत्तर : 2. "Fetal period"
व्याख्या :

Answer: B) Fetal period Explanation: The third and longest period of prenatal development, extending from the ninth week until birth is Fetal period.   The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week are known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.

प्र: Corporation Tax is imposed by 2408 0

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    Central Government
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    State Government
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    Local Government
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    None
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उत्तर : 1. "Central Government"
व्याख्या :

Answer: A) Central Government Explanation: Corporation tax is a tax imposed on the net income of the company. Companies, both private and public which are registered in India under the Companies Act 1956, are liable to pay corporate tax. Taxes in India are levied by the Central Government and the state governments. Some minor taxes are also levied by the local authorities such as the Municipality. The authority to levy a tax is derived from the Constitution of India which allocates the power to levy various taxes between the Central and the State.   Hence, Corporate Tax is imposed by Central Government.

प्र: Natural Rubber is a Polymer of 2408 0

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    butadiene
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    2methyl-1,3butadiene
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    ethylene
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    isoprene
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उत्तर : 4. "isoprene"
व्याख्या :

Answer: D) isoprene Explanation: Natural Rubber is a Polymer derived from Isoprene.  Natural rubber is an addition polymer that is obtained as a milky white fluid known as Latex from a Tropical Rubber Tree.

प्र: In how many ways the letters of the word NUMERICAL can be arranged so that the consonants always occupy the even places ? 2403 0

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    5!
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    6!
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    4!
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    Can't determine
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उत्तर : 4. "Can't determine"
व्याख्या :

Answer: D) Can't determine Explanation: NUMERICAL has 9 positions in which 2, 4, 6, 8 are even positions. And it contains 5 consonents i.e, N, M, R, C & L. Hence this cannot be done as 5 letters cannot be placed in 4 positions. Therefore, Can't be determined.

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