Vadrmati

Poll

Asked: April 27, 2021In: Class 10 Science

The pH of water sample collected from a river was found to be acidic in the range 3.5-4,5. On the banks of river ware several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

CBSE 2022-2023. NCERT Science. CH: 16 Sustainable Management of Natural Resources. Important Questions. Important MCQ . Class 10. Biology CBSE Board and other state board. NCERT book extra Questions.

Poll

Vachasya

Asked: April 27, 2021In: Class 10 Science

Tehri Dam is being constructed on

NCERT Important Questions Class 10 Science Biology Chapter 16 Important NCERT Extra Questions Chapter 16 Management of Natural Resources NCERT Book Extra Questions for Session 2022-2023 CBSE Board and UP Board Others state Board

Poll

satyanarayan123

Asked: April 27, 2021In: Class 10

The most rapidly dwindling natural resource in the world is

CBSE 2022-2023. NCERT Science. CH: 16 Sustainable Management of Natural Resources. Important Questions. Important MCQ. Class 10 Biology. CBSE Board and other state board. NCERT book extra Questions.

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

(a) A monoenergetic electron beam with electron speed of 5.20 × 10⁶ m s⁻¹ is subject to a magnetic field of 1.30 × 10⁻⁴ T normal to the beam velocity. What is the radius of the circle traced by the beam, given e/m for electron equals 1.76 × 10¹¹C kg⁻¹. (b) Is the formula you employ in (a) valid for calculating radius of the path of a 20 MeV electron beam? If not, in what way is it modified? [Note: Exercises 11.20(b) and 11.21(b) take you to relativistic mechanics which is beyond the scope of this book. They have been inserted here simply to emphasise the point that the formulas you use in part (a) of the exercises are not valid at very high speeds or energies. See answers at the end to know what ‘very high speed or energy’ means.]

Class 12 Physics CBSE and UP Board Dual Nature of Radiation and Matter Chapter-11 Exercise 11.21 NCERT Solutions for Class 12 Physics Chapter 11 Question-21 Additional Exercise

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used: λ ₁ = 3650 Å, λ ₂= 4047 Å, λ ₃ = 4358 Å, λ₄ = 5461 Å, λ₅ = 6907 Å, The stopping voltages, respectively, were measured to be: V0₁ = 1.28 V, V0₂= 0.95 V, V0₃= 0.74 V, V0₄ = 0.16 V, V0₅ = 0 V Determine the value of Planck’s constant h, the threshold frequency and work function for the material. [Note: You will notice that to get h from the data, you will need to know e (which you can take to be 1.6 × 10⁻¹⁹C). Experiments of this kind on Na, Li, K, etc. were performed by Millikan, who, using his own value of e (from the oil-drop experiment) confirmed Einstein’s photoelectric equation and at the same time gave an independent estimate of the value of h.]

Class 12 Physics CBSE and UP Board Dual Nature of Radiation and Matter Chapter-11 Exercise 11.28 NCERT Solutions for Class 12 Physics Chapter 11 Question-28 Additional Exercise

satyanarayan123

Asked: April 27, 2021In: Class 10 Science

The most appropriate definition of a natural resource is that it is a substance commodity that is (a) present only on land.(b) a gift of nature which is very useful to mankind. (c) a man-made substance placed in nature.(d) available only in the forest

CBSE 2022-2023, NCERT Science, CH: 16 Sustainable Management of Natural Resources, Important Questions, Important MCQ , Class 10 Biology CBSE Board and other state board. NCERT book extra Questions.

satyanarayan123

Asked: April 27, 2021In: Class 10 Science

Which one of the following is a green house gas? (i) Nitrogen dioxide (ii) Carbon dioxide (iii) Sulphur dioxide (iv)Carbon monoxide

CBSE 2022-2023, NCERT Science, CH: 16 Sustainable Management of Natural Resources, Important Questions, Important MCQ . Class 10 Biology

satyanarayan123

Asked: April 27, 2021In: Class 10 Science

At present consumption rate, the petroleum resources of the world will last for another

CBSE 2022-2023, NCERT Science, CH: 16 Sustainable Management of Natural Resources, Important Questions, Important MCQ , Class 10 Biology CBSE Board and other state board. NCERT book extra Questions.

satyanarayan123

Asked: April 27, 2021In: Class 10 Science

Floods can be prevented by (i) afforestation (ii) removing the top soil (iii) Cutting the forest (iv) tilling the land

CBSE 2022-2023, NCERT Science, CH: 16 Sustainable Management of Natural Resources, Important Questions, Important MCQ , Class 10 Biology

Gagan Arora

Asked: April 22, 2021In: Class 10 Social Science

Describe the role of caste-politics in India.

NCERT Important Questions Class 10 Social Science Civics Chapter 4 Important NCERT Extra Questions Chapter 4 Gender, Religion and Caste NCERT Book Extra Questions for Session 2022-2023 CBSE Board and UP Board Others state Board

Vadrmati

The pH of water sample collected from a river was found to be acidic in the range 3.5-4,5. On the banks of river ware several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

Tehri Dam is being constructed on

The most rapidly dwindling natural resource in the world is

The most appropriate definition of a natural resource is that it is a substance commodity that is (a) present only on land.(b) a gift of nature which is very useful to mankind. (c) a man-made substance placed in nature.(d) available only in the forest

Which one of the following is a green house gas? (i) Nitrogen dioxide (ii) Carbon dioxide (iii) Sulphur dioxide (iv)Carbon monoxide

At present consumption rate, the petroleum resources of the world will last for another

Floods can be prevented by (i) afforestation (ii) removing the top soil (iii) Cutting the forest (iv) tilling the land

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