IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: I have keys but no locks, I have space but no room. You can enter but can't go outside. What am I? 1174 0

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उत्तर :
व्याख्या :

I am Keyboard. A Keyboard has keys of letters, space button and enter button.

प्र: The hot holding temperature for potentially hazardous foods must be 1604 0

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    not less than 60 deg
    सही
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  • 2
    less than 60 deg
    सही
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  • 3
    less than 5 deg
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  • 4
    None of the above
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उत्तर : 1. "not less than 60 deg"
व्याख्या :

Answer: A) not less than 60 deg Explanation: Potentially hazardous foods are foods that might contain food poisoning bacteria and are capable of supporting growth of these bacteria or formation of toxins to levels that are unsafe for consumers, if the foods are not stored at correct temperatures. Toxins are poisonous chemicals produced by some types of bacteria. The food can be left at room temperature until it reaches 60 deg C because food-poisoning bacteria will not multiply at 60 deg C or above. However, do not leave food cooling at room temperature unless you are sure that the temperature of the food is still at least above 60 C.

प्र: What is the first step when supervising detainee operations? 1570 0

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उत्तर :
व्याख्या :

The first step is to disarm and secure detainees when supervising detainee operations.

प्र: Which of the following elements is a metalloid? 1525 0

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    arsenic
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    boron
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  • 3
    antimony
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  • 4
    All of the above
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उत्तर : 4. "All of the above"
व्याख्या :

Answer: D) All of the above Explanation: A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them. The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium.

प्र: What name is given to the bond between water molecules? 1431 0

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    Polar
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  • 2
    Polar covalent
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  • 3
    Hydrogen
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  • 4
    None of the above
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उत्तर : 3. "Hydrogen"
व्याख्या :

Answer: C) Hydrogen Explanation: The name given to the bond between water molecules is a hydrogen bond. These bonds occur between the slightly negative oxygen of one water molecule and the slightly positive hydrogen of another water molecule. Hydrogen bonding gives water special physical properties.   The differences in electronegativity between hydrogen and oxygen lead to an unequal sharing of electrons. Electronegativity measures how strongly an atom attracts electrons. Oxygen, with its higher electronegativity, pulls on the shared electrons more, giving the oxygen atom a partial net negative charge. The shared electrons spend less time with the hydrogen atoms; therefore, the hydrogen regions of water have partial positive charges.

प्र: Which statement best compares a line and a point? 2180 0

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    A point has no dimension and a line has one dimension.
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  • 2
    A line can have line segments on it whereas a point cannot be on any line segment.
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  • 3
    point is a location whereas a line has several planes located on it
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  • 4
    A line can lie on a plane whereas a point cannot lie on a plane.
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उत्तर : 1. "A point has no dimension and a line has one dimension."
व्याख्या :

Answer: A) A point has no dimension and a line has one dimension. Explanation: A point has no dimension and a line has one dimension is the statement that best compares a line and a point.

प्र: The food and drug administration sets standards for 3105 0

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    product labeling
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  • 2
    traffic safety
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    advertising
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  • 4
    the environment
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उत्तर : 1. "product labeling"
व्याख्या :

Answer: A) product labeling Explanation: The FDA is responsible for protecting and promoting public health through the control and supervision of food safety, tobacco products, dietary supplements, prescription and over-the-counter pharmaceutical drugs (medications), vaccines, biopharmaceuticals, blood transfusions, medical devices, electromagnetic radiation emitting devices (ERED), cosmetics, animal foods & feed and veterinary products.

प्र: What was the goal of the temperance movement? 1750 0

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    No alcohol
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  • 2
    No tobacco
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  • 3
    Both A & B
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  • 4
    None of the above
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उत्तर : 1. "No alcohol"
व्याख्या :

Answer: A) No alcohol Explanation: The temperance movement of the late nineteenth and early twentieth centuries was an exception in many ways: "Temperance" refers to the moderate consumption of alcoholic beverages.   However, in the context of the temperance movement, the term usually indicated complete abstinence, which means drinking no alcohol at all. The goal of the temperance movement in the United States was to make the production and sale of alcohol illegal. Supporters believed that prohibiting alcohol would solve a number of society's problems, making people safer, healthier, and more productive.

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