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Questions and Answers

Which of the following is not a cause of biodiversity degradation?

  • Afforestation (correct)
  • Industrialization
  • Excessive grazing in natural forests
  • Illegal excavation of rocks, gravel and sand from rivers

Which of the following plants reproduce by vegetative propagation through leaves?

  • Bryophyllum, sugarcane
  • Bryophyllum, Begonia (correct)
  • Rose, Sissoo
  • Onion, garlic

What is the process in which pollination takes place by the transfer of pollen grains through water in aquatic plants called?

  • Entomophily
  • Anemophily
  • Hydrophily (correct)
  • Ornithophily

If a car starts from rest and its velocity becomes 40 m/s in 10 seconds, what is its acceleration?

<p>4 m/s² (A)</p> Signup and view all the answers

What is the work done by the effort in a machine called?

<p>Input work (C)</p> Signup and view all the answers

Which of the following statements is true?

<p>Pressure decreases with increasing area (B)</p> Signup and view all the answers

If the speed of sound in air is 332 m/s, what is the wavelength of the longest sound wave that can be heard by humans?

<p>16.6 m (A)</p> Signup and view all the answers

There are 4 electric bulbs (60W each) in a house that are used for 3.5 hours daily. If the cost per unit of electricity is Rs. 8.50, what is the monthly electricity bill?

<p>Rs 2142 (B)</p> Signup and view all the answers

Flashcards

Biodiversity Degradation

The loss of biodiversity in a specific area.

Vegetative Propagation through Leaves

A form of plant propagation where a new plant is produced from parts of another plant, like the leaves.

Hydrophily: Pollination by Water

The method of pollination where pollen grains are transported by water.

Acceleration

The rate at which the velocity of a moving object changes with time.

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Input Work

The work done by applying a force to move an object.

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Pressure

The force exerted per unit area.

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Wavelength of the Lowest Audible Sound

The longest sound wave that humans can hear.

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Electricity Consumption

The amount of electrical energy consumed by a device over a specific time period.

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