IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A jogger running at 9 kmph alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 kmph in the same direction. In how much time will the train pass the jogger  ? 1787 0

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    10 sec
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    48 sec
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    36 sec
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  • 4
    56 sec
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उत्तर : 3. "36 sec"
व्याख्या :

Answer: C) 36 sec Explanation: Given speed of jogger = 9 kmph Speed of train = 45 kmphAs they are in same direction, Relative speed = 45 - 9 = 36 kmph = 36x5/18 = 10 m/sDistance = 240 + 120 = 360 mts Time = distance/speed = 360/10 = 36 sec.

प्र: Guess the Hiding Letter  ? 1787 0

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    D
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    K
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    L
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    G
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उत्तर : 4. "G"
व्याख्या :

Answer: D) G Explanation: Starting from letter 'S' add 5 in the clock wise direction to get the next letter in English alphabets. Here S + 5 => 19 + 5 = 24 => X X + 5 = 24 + 5 = 3 => C Similarly,  B + 5 = G

प्र: How many six digit odd numbers can be formed from the digits 0, 2, 3, 5, 6, 7, 8, and 9 (repetition not allowed)? 1787 0

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    8640
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    720
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    3620
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  • 4
    4512
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उत्तर : 1. "8640"
व्याख्या :

Answer: A) 8640 Explanation: Let the 6 digits of the required 6 digit number be abcdef Then, the number to be odd number the last digit must be odd digit i.e 3, 5, 7 or 9 The first digit cannot be ‘0’ => possible digits = 3, 5, 7, 2, 6, 8 Remaining 4 places can be of 6 x 5 x 4 x 3 ways This can be easily understood by Therefore, required number of ways = 6 x 6 x 5 x 4 x 3 x 4 = 36 x 20 x 12 = 720 x 12 = 8640 ways.

प्र: Water is an excellent solvent because 1787 0

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उत्तर :
व्याख्या :

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients

प्र: Which of the following chemical compounds has the highest boiling point? 1786 0

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    Dimethyl ether (CH3OCH3)
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    Methanol (CH3OH)
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    Methane (CH4)
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  • 4
    None
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उत्तर : 2. "Methanol (CH3OH)"
व्याख्या :

Answer: B) Methanol (CH3OH) Explanation: Chemical Compounds with stronger intermolecular forces have higher boiling points.   The order of strengths of intermolecular forces is:  London dispersion < dipole-dipole < H-bonding   Methane (CH4) — London dispersion forces Dimethyl ether (CH3OCH3) — dipole-dipole attractions Methanol (CH3OH) — hydrogen bonding Therefore, Methanol - CH3OH with H-Bonding have highest Boiling Point among the given chemical compounds.

प्र: The closest algal relatives of land plants are 1786 0

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    charophytes
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    chrysophytes
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    rhodophytes
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    bacillariophytes
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उत्तर : 1. "charophytes"
व्याख्या :

Answer: A) charophytes Explanation: The charophytes are the extant group of green algae that are most closely related to modern land plants.

प्र: What is the functional unit of a skeletal muscle called? 1785 0

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    Myofibril
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    Sarcomere
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    Fiber
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    Fasciculus
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उत्तर : 2. "Sarcomere"
व्याख्या :

Answer: B) Sarcomere Explanation: The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, which are the basic functional units of the skeletal muscle.

प्र: What does the judicial branch do? 1785 0

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उत्तर :
व्याख्या :

The United States government has 3 branches, which all serve an important role in running the government and keeping our system of laws in place.   1. The legislative branch 2. The executive branch  3. The judicial branch   The legislative branch makes the laws while the executive branch enforces these laws.  The judicial branch is a system of courts that applies the laws.   Both the federal government and each of the 5 states have individual judicial branches which all serve this purpose.   For example ::  If the federal government were like a basketball game, the judicial branch is much like the referee that helps settle disputes. The executive branch and the legislative branch are often like the players in the game trying to score points against each other, and the judicial branch is there to clarify the rules and make sure each side is acting fairly.

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