Tag: substances, objects and energy

Questions Related to substances, objects and energy

Which of the following statements about pinhole camera are correct?
(i) It is a camera with a single lens.
(ii) It produces an upside down image of object.
(iii) It does not have a screen.
(iv) It works because light travels in a straight line.
(v) It forms real and colourless shadows of objects.

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. (i) and (v) only

  2. (ii) and (iv) only

  3. (i), (iii) and (iv) only

  4. (ii), (iv) and (v) only

Show answer
Correct Option: B
Explanation:

A pinhole camera is a simple camera without a lens but with a tiny aperture. A pinhole is effectively a light proof box with a small hole in one side. Light from a scene passes through the aperture and projects an invested image on the opposite side of the box.
The image of a pinhole camera may be projected onto a translucent screen for real time viewing.

A good source of energy would be the one which would do a _______ amount of work per unit volume of mass. Any source of energy we use to do work is consumed & _______ used again.

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. larger, can be

  2. smaller, can be

  3. larger, cannot be

  4. smaller, cannot be

Show answer
Correct Option: C
Explanation:

A good source of energy would be the one which would do a larger amount of work per unit volume of mass. Any source of energy we use to do work is consumed & cannot be used again.
A good source of energy should have the following characteristics:
  1. It should do a large amount of work per unit mass or volume - it means that the output energy must be more than the input energy. It should have high calorific value.
  2. It should be easily accessible - the energy source should be able to provide energy over a long period of time. Example: coal and petroleum.
  3. Should be easy to store and transport - most common sources of energy such as coal, petrol and LPG need to be transported to users from their points of production. They also need proper storage. Thus it is important to store and transport these sources safely and economically.
  4. Safe and convenient to use - energy sources should be safe as it is used by a large number of people and should be convenient.

The fuel used in wick stoves to cook food is _____

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. petroleum

  2. kerosean

  3. diesel

  4. paraffin wax

Show answer
Correct Option: A

Wind turbines convert which of the following energy into mechanical energy?

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy

  1. Potential energy

  2. Kinetic energy

  3. Solar energy

  4. None of these

Show answer
Correct Option: B
Explanation:

Kinetic energy,

Wind turbines convert the kinetic energy in the wind into mechanical power. This mechanical power can be used for specific tasks (such as grinding grain or pumping water) or a generator can convert this mechanical power into electricity to power homes, businesses, schools, and the like.

Wind is beneficial resource as it doesn't cause pollution and it's ______. 

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy

  1. free

  2. rare

  3. steady

  4. costly

Show answer
Correct Option: A
Explanation:

Wind is a beneficial resource because it is a no-emissions energy source, so it produces no air or water pollution. Its operational costs are pretty low as wind is free. Wind energy is very efficient. Wind power is considered as a renewable energy resource. This means that the power generated from wind is replenished by the environment over relatively short periods of time.

The first windmill used for the production of electric power was built in which of the following countries?

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy

  1. France

  2. Scotland

  3. Switzerland

  4. Afghanistan

Show answer
Correct Option: B
Explanation:

The first windmill used for the production of electric power was built in Scotland in July 1887. It was built by Prof James Blyth of Anderson's College, Glasgow. Its height was 10 metres. Wind turbine was installed in the garden of his holiday cottage. It was used to charge accumulators developed by the Frenchman Camille Alphonse Faure, to power the lighting in the cottage. 

A solar cell converts:

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy conservation of fossil fuels

  1. heat energy into electrical energy

  2. solar energy into electrical energy

  3. heat energy into light energy

  4. solar energy into light energy

Show answer
Correct Option: B
Explanation:

Solar-powered photovoltaic (PV) panels convert the sun's rays into electricity by exciting electrons in silicon cells using the photons of light from the sun. This electricity can then be used to supply renewable energy to your home or business. Light striking a silicon semiconductor causes electrons to flow, creating electricity. Solar power generating systems take advantage of this property to convert sunlight directly into electrical energy. 

Plants store solar energy in the form of:

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy conservation of fossil fuels

  1. electric energy

  2. thermal energy

  3. chemical energy

  4. bio energy

Show answer
Correct Option: C
Explanation:

Plants trap the solar energy and convert it into chemical energy by the process of photosynthesis.This chemical energy in the form of carbohydrates or sugar is used as food.

The main source of energy for all living beings on earth is:

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy conservation of fossil fuels

  1. bio energy

  2. hydral energy

  3. wind energy

  4. solar energy

Show answer
Correct Option: D
Explanation:

Solar energy is the renewable source of energy which is essential for all living beings.All plant life needs solar energy to prepare their food by photosynthesis and the animal life is dependent on plants directly or indirectly.So it is the prime source of energy.

    What is the primary source of energy ?
evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy conservation of fossil fuels

  1. Tides

  2. Wood

  3. Cow dunk

  4. Sun

Show answer
Correct Option: D
Explanation:

The Sun is the primary source of energy for Earth's climate system is the first of seven Essential Principles of Climate Sciences. Principle 1 sets the stage for understanding Earth's climate system and energy balance. The Sun warms the planet, drives the hydrologic cycle, and makes life on Earth possible.Each second, more than four million tonnes of matter are converted into energy within the Sun's core, producing neutrinos and solar radiation.