IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Where are Maglev trains used? 1625 0

  • 1
    London
    सही
    गलत
  • 2
    Russia
    सही
    गलत
  • 3
    Germany
    सही
    गलत
  • 4
    Japan
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 4. "Japan"
व्याख्या :

Answer: D) Japan Explanation: Maglev trains are used in Japan, South Korea and China only. Maglev derived from magnetic levitation using the principle of magnetic repulsion is a system of train transportation that uses two sets of magnets, one set to repel and push the train up off the track as in levitation then another set to move the 'floating train' ahead at great speed taking advantage of no friction. Maglev trains are therefore quieter and smoother than conventional trains, and have the potential for much higher speeds Despite over a century of research and development, maglev transport systems are in operation in just three countries Japan, South Korea and China.   Hence Maglev -- Magnetic-levitation.

प्र: What does this symbol mean '&'? 2300 0

  • 1
    Caret
    सही
    गलत
  • 2
    Bar
    सही
    गलत
  • 3
    Ampersand
    सही
    गलत
  • 4
    Reversed Caret
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 3. "Ampersand"
व्याख्या :

Answer: C) Ampersand Explanation: '&' is a Logical Symbol and is called as Ampersand.   ^ is called Caret - is called Bar v is called Reversed Caret.

प्र: Lightning heats the surrounding air to 1960 0

  • 1
    300 deg Cent
    सही
    गलत
  • 2
    3000 deg Cent
    सही
    गलत
  • 3
    30000 deg Cent
    सही
    गलत
  • 4
    300000 deg Cent
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 3. "30000 deg Cent"
व्याख्या :

Answer: C) 30000 deg Cent Explanation: Lightning is extremely hot — a flash can heat the air around it to temperatures five times hotter than the sun’s surface. This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash. Lightning heats the surrounding air to about 30,000 degrees Centigrades.

प्र: Which statement best describes electrons? 1851 0

  • 1
    Electrons orbit around the nucleus
    सही
    गलत
  • 2
    Electrons are composed of protons and neutrons
    सही
    गलत
  • 3
    Electrons reside in the nucleus
    सही
    गलत
  • 4
    Electrons have a positive charge
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 1. "Electrons orbit around the nucleus"
व्याख्या :

Answer: A) Electrons orbit around the nucleus Explanation: Electrons orbit around the nucleus is correct about them.

प्र: A merchant commences with a certain capital and gains annually at the rate of 30 per cent. At the end of 2 years he has worth Rs 10,000. What was the original capital? 1427 0

  • 1
    Rs. 4987
    सही
    गलत
  • 2
    Rs. 5148
    सही
    गलत
  • 3
    Rs. 5917
    सही
    गलत
  • 4
    Rs. 6254
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 3. "Rs. 5917"
व्याख्या :

Answer: C) Rs. 5917 Explanation: Let the Original capital amount be Rs. P Given after 2 years the amount is Rs. 10000 Rate of interest = 30% According to the question, P x 130100 x 130100 = 10000=> P = 1000000169 = 5917 Therefore, the capital amount P = Rs. 5917

प्र: What type of Lipid is Estrogen? 1464 0

  • 1
    phospholipid
    सही
    गलत
  • 2
    steroid
    सही
    गलत
  • 3
    wax
    सही
    गलत
  • 4
    triglyceride
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 2. "steroid"
व्याख्या :

Answer: B) steroid Explanation: Estrogen is a group of steroid hormone that control the development and maintenance of an individuals feminine characteristics. Natural estrogen exists in men as well as women and are found in higher amounts in women Especially in those of reproductive age.   Estrogens are hormones which are responsible to the body functions of the female body system such as menstruation, development of the female body such as pubic hair, breasts and development of the proportions of the body.   Lipids act as best energy storage molecules as the cleavage of fatty acids produces both energy and metabolic water which is a main component in almost all lipids.

प्र: Unlike Mitosis, Meiosis results in the formation of 1668 0

  • 1
    2N daughter cells
    सही
    गलत
  • 2
    Haploid cells
    सही
    गलत
  • 3
    body cells
    सही
    गलत
  • 4
    Diploid cells
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 2. "Haploid cells"
व्याख्या :

Answer: B) Haploid cells Explanation: Unlike Mitosis, Meiosis results in the formation of 4 Genetically different cells.   Meiosis results in the formation of 4 Haploid daughter cells from one Diploid parent cell.

प्र: I can Honk without using a Horn. Who am I? 2047 0

  • 1
    Goose
    सही
    गलत
  • 2
    Crane
    सही
    गलत
  • 3
    Penguin
    सही
    गलत
  • 4
    Humming
    सही
    गलत
  • उत्तर देखेंउत्तर छिपाएं
  • Workspace

उत्तर : 1. "Goose"
व्याख्या :

Answer: A) Goose Explanation: Goose can Honk without using a Horn. Geese are waterfowl of the family Anatidae.

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई

      त्रुटि की रिपोर्ट करें

    कृपया संदेश दर्ज करें
    त्रुटि रिपोर्ट सफलतापूर्वक जमा हुई