IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Which of the following is an example of chemical weathering? 1312 0

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    Oxidation
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    Acid rains
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    Carbonation
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    All the above
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उत्तर : 4. "All the above"
व्याख्या :

Answer: D) All the above Explanation: Chemical weathering is what happens when rocks are broken down and chemically altered. Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

प्र: The command to eliminate a table from a database is 2769 0

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    REMOVE TABLE CUSTOMER;
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    UPDATE TABLE CUSTOMER;
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    DELETE TABLE CUSTOMER;
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    DROP TABLE CUSTOMER;
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उत्तर : 4. "DROP TABLE CUSTOMER;"
व्याख्या :

Answer: D) DROP TABLE CUSTOMER; Explanation: The SQL DROP TABLE statement is used to remove a table definition and all data, indexes,...

प्र: 12 N in a C = 1745 0

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उत्तर :
व्याख्या :

12 N in a C means 12 Numbers in a Clock.

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उत्तर :
व्याख्या :

The letter 'E'. As of the above given data, It is in the 1st place in Earth, 2nd in Heaven and in the middle of the Sea. It appears once in a Year and twice in a Week. It is present in February, June, September, October, November & December. But not in the Month.   Hence, it is the letter 'E'.

प्र: The purpose of choke in tube light is 1725 0

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    Induce high voltage
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    Induce low resistance
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    Induce high resistance
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  • 4
    Induce low voltage
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उत्तर : 1. "Induce high voltage"
व्याख्या :

Answer: A) Induce high voltage Explanation: When the switch is ON, in a tube light choke is nothing but the coil/ballast ( inductor) which is used to induce the high voltage across it. as we know that inductor has property to induce high voltage for the brief period of time, this high voltage is required to ionize the gases in the starter. Then gas inside the starter gets ionized due to this full voltage and heats the bimetallic strip that is caused to be bent to connect to the fixed contact. Current starts flowing through the starter. Although the ionization potential of the neon is the little bit more than that of the argon but still due to small electrode gap high voltage gradient is appeared in the neon bulb and hence glow discharge is started first in a starter. As voltage gets reduced due to the current causes a voltage drop across the inductor, the strip cools and breaks away from the fixed contact. At that moment a large L di/dt voltage surge comes across the inductor at the time of breaking. This high valued surge comes across the tube light electrodes and strikes penning mixture (mixture argon gas and mercury vapor). Gas discharge process continues and current gets the path to flow through the tube light gas only due to low resistance as compared to the resistance of starter.

प्र: How many Lok Sabha seats belong to Rajasthan? 2063 0

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    25
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    17
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    48
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    2
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उत्तर : 1. "25"
व्याख्या :

Answer: A) 25 Explanation: The maximum size of the Lok Sabha as outlined in the Constitution of India is 552 members made up of up to 530 members representing people of the states of India and up to 20 members representing people from the Union Territories on the basis of their population and 2 Anglo-Indians are nominated by President. The number of Parliamentary Seats for the States : Andhra Pradesh & Rajasthan - Each 25 Maharashtra - 48 Telangana - 17 Arunachal Pradesh, Bihar, Manipur, Meghalaya, Tripura - Each 02  Uttar Pradesh has the highest with - 80

प्र: Which of the following is an Autoimmune disease? 1319 0

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    Systematic lupus erythematosus
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    Acute anaphylaxis
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    Farmer's lung
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    A heart attack
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उत्तर : 1. "Systematic lupus erythematosus"
व्याख्या :

Answer: A) Systematic lupus erythematosus Explanation: An autoimmune disease is a condition in which your immune system mistakenly attacks your body.   The immune system normally guards against germs like bacteria and viruses. When it senses these foreign invaders, it sends out an army of fighter cells to attack them. Normally, the immune system can tell the difference between foreign cells and your own cells.   In an autoimmune disease, the immune system mistakes part of your body — like your joints or skin — as foreign. It releases proteins called autoantibodies that attack healthy cells. Some autoimmune diseases target only one organ. Type 1 diabetes damages the pancreas. Other diseases, like lupus, affect the whole body.   Hence, Systematic lupus erythematosus is an autoimmune disease that affects multiple organs.

प्र: Which of the following is a false statement? 1177 0

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    As bond order increases the strength of the bond increases
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    Bond order is proportional to the bond length
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    Molecules with negative bond order are highly unstable
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    Bond order is inversely proportional to the bond length
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उत्तर : 2. "Bond order is proportional to the bond length"
व्याख्या :

Answer: B) Bond order is proportional to the bond length Explanation: Bond order is proportional to the bond length is a False statement since Bond order is inversely proportional to the bond length.

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