Class 10- Science- Source of EnergyContact Number: 8527521718Class 10- Science- Source of EnergyContact Number: 8527521718The major causes of environmental pollution is the use of
1. Biomass energy
2. Fossil fuels
3. Ocean energy
4. Hydrogen as a fuel
The coal reservoirs in our country are expected to last for another
1. 1000 years
2. 250 years
3. 400 years
4. 500 years
A tree usually matures in more than
1. 15 years
2. 100 years
3. 50 years
4. 60 years
The approximate value of solar constant is
1. 1.4 k W/
2. 1.4 k W/min
3. 1.4 k J/
4. 1.4 k W/
The heat in the sunlight is due to
1. vosoble radiation
2. entire solar radiation
3. ultra-violet radiation
4. infra-red radiation
A good fuel is one which possesses
1. moderate ignition temperature
2. high ignition temperature
3. high calorific value
4. both (a) and (c)
Which of the following variety of coal cnontains the highest percentage of carbon?
1. Anthracite
2. Peat
3. Lignite
4. Bituminous
The device which harnesses solar enerrgy directly is
1. Solar cell
2. Biogass plant
3. Coal gas plant
4. Natural gas plant
U-235 content in natural uranium is
1. 99.2%
2. 100%
3. 0.006%
4. 0.714%
Energy released in the fission of one nucleus of U-235 is about
1. 200 Me V
2. 2000 Me V
3. 1 Me V
4. 20 Me V
One Me V of energy is equivalent to
1.
2.
3.
4.
One unified atomic mass unit (u) is equivalent to
1. 931 Me V
2. 931 e V
3. 1 e V
4. 1 Me V
Coomon moderator used in nuclear reactor is
1. boron
2. uranium
3. graphite
4. cadmium
Disposal of nuclear waste is a challange because it is
1. radioactive
2. foul smelling
3. too large
4. too heavy
Uncontrolled nuclear chain reaction is the basis of
1. hydrogen bomb
2. atom bomb
3. nuclear reactor
4. none of these
Which of the following is a better nuclear fuel?
1. Thorium-236
2. Uranium-235
3. Neptunium-239
4. Plutonium-239
When we use biomass to generate electricity we convert - energy locked in the biomass to electrical energy
1. chemical
2. kinetic
3. nuclear
4. muscular
The energy released per unit mass is
1. more for fusion than for fission
2. more for fission than for fusion
3. equal for both fusion and fission
4. varies from time to time
Which among the following is not a renewable source of energy?
1. Wind energy
2. Ocean energy
3. Solar energy
4. Fossil energy
Most of the energy we use originally came from
1. the sun
2. the air
3. the soil
4. the ocean
Electrical energy can be produced from
1. mechanical energy
2. chemical energy
3. radiant energy
4. all of the above
Global warming focusses on an increase in the level of which gas in the atmosphere?
1. ozone
2. sulfur dioxide
3. carbon dioxide
4. nitrous oxide
How much of the enrgy in burning coal reaches the consumer as electricity
1. 1/3 (one-third)
2. 1/2 (one-half)
3. 3/4 (three-quarters)
4. 9/10 (nine-tenths)
In a nuclear power plant, uranium atoms
1. combine and give off heat energy
2. split and give off heat energy
3. burn and give off heat energy
4. split and give off electron
A substance which produces a lot of heat on burning is called_____.
1. oxidising agent
2. biogas
3. biomass
4. fuel
Fuel formed under the earth's surface by the decomposition of organic matter is called
1. organic fuel
2. biogas
3. fossil fuel
4. underground fuel
The radiations emitted by a hot furnace are
1. ultra-violet
2. infra-red
3. X-rays
4. microwaves
Which of the followingis not combustible?
1. oxygen
2. hydrogen
3. butane
4. methane
Floating generators are used in the sea to harness
1. tidal energy
2. wave energy
3. hydel energy
4. energy from OTEC power plant
Nuclear fusion reactions happens spontaneously in
1. the core of earth
2. the commercial nuclear reactor
3. the atmosphere of the sun
4. the eruption of the volcano
The energy recieved by the Earth directly from the sun is approximately which percentage of the sun's total energy output?
1. 0.00000005%
2. 0.00005%
3. 1%
4. 0.001%
The percentage of the solar energy reaching the Earth recieved by the plant is
1. 10%
2. 0.1%
3. 5%
4. 1%
The percentage of the solar energy that strikes the periphery of the Earth is trapped by Earth?
1. 15%
2. 100%
3. 75%
4. 47%
The fraction of sunlight which consists of infrared radiation is
1.
2.
3.
4.
efficiency of modern solar cells is
1. 60%
2. 15%
3. 100%
4. 90%
The production of a solar cookers ona commerecial scale in India began in
1. 1962
2. 1980
3. 1950
4. 1970
The main constituent of natural gas is
1. hydrogen
2. oxygen
3. butane
4. methane
LPG consists mainly of
1. butane
2. liquid hydrogen
3. methane
4. ethane
The approximate temperature of the surface of the sun is
1.
2.
3.
4.
Which of the following is a primary fuel?
1. Petrol
2. Diesel
3. Kerosene
4. Wood
Which of the following is a secondary fuel?
1. Diesel
2. Natyral gas
3. Wood
4. Coal
Energy released in the fission of 1 kg of U-235 is equivalent to energy obtained from burning of coal weighing
1. 2500 ton
2. 25000 ton
3. 25 ton
4. 250 ton
If mass equivalent to one mass of proton is completely converted into energy then the energy produced is
1. 931.49 Me V
2. 913.49 Me V
3. 391.49 Me V
4. 931.49 Me V
Most of the fuels are
1. carbon compounds with sulphure
2. nitrogen compounds with carbon
3. carbon compounds with hydrogen
4. none of these
A nucleus breaks into two parts whose velocity is in ratio 2:1. The ratio of their radius is
1.
2.
3.
4.
Natural gas is transported mainly by
1. pipelines
2. trucks
3. barges
4. all three equally
Today, which renewable energy source provides the india with the most energy?
1. wind
2. solar
3. geothermal
4. hydropower
The molten material mixed with gases in the mantle of the earth is called
1. core
2. lava
3. geyser
4. magma
The scientist who first carried out critical nuclear fission reaction is
1. Otto Hahn
2. Enrico Fermi
3. Hans Bethe
4. Einstein
India exploded its first undergroung nuclear device at
1. Kota
2. Ranchi
3. Jaipur
4. Pokhran