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Which of the following statements are true for renewable energy? a. Energy obtained from natural and persistent flow of energy occurring in the immediate environment. b. The renewable energy is obtained from static stores of energy that remain underground unless released by human interaction. c. It is also called as Green energy Sustainable energy. d. It is the energy supplied by finite supplies or Brown energy.
The chapter in Class V NCERT EVS textbook titled, ‘Sunita in Space’ describes astronaut Sunita Williams’ experiences in a spaceship. What could be the reason/reasons for including this? A. This incident gives a peep into the life of an astronaut. B. This incident describes physical conditions in a spaceship. C. This incident challenges gender stereotypes. D. This incident helps in explaining the concept of gravity.
Ratio of the amount of heat radiation, transmitted through the body to the amount of heat radiation incident on it, is known as ___________
Match the following Device Conversion of Energy (a) Windmill (i) Chemical Energy to electrical energy (b) Bulb (ii) Kinetic Energy to Electrical Energy (c) Electrical Cell (iii) Sound Energy to Electrical energy (d) Microphone (iv) Electrical Energy to Light Energy
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Modern civilization is completely dependent on energy, which has therefore to be abundant and also economical. About 85% of the world's energy is supplied by oil, coal and natural gas while nuclear, hydro, wind and solar power and biomass supply the rest. Coal, nuclear and hydro are used primarily to generate electricity while natural gas is widely used for heating. Biomass is used both for heating and cooking. The wind and solar power is the future's hope as they are sustainable energy sources. Oil powers almost all machines that move and that makes oil uniquely versatile. Oil powered airplanes carry 500 people across the widest oceans at nearly the speed of sound. Oil powered machines produce and transport food. Oil powered machines are ubiquitous. Clearly, we live in the age of oil but it is drawing to a close. According to data available if oil production remains constant until it's gone, there is enough to last 42 years. Oil wells will produce less as they become depleted, which will make it impossible to keep production constant. Similarly natural gas and coal will last another 61 years and 133 years respectively. Naturally, as they become scarce, they become expensive, leading to a worldwide energy crisis. If we are to survive on this planet, we have to make a transition to sustainable energy sources. The transition may be willy-nilly or planned - the choice is ours. The dawning era of limited and expensive energy will be very difficult for everyone on earth but will be even more difficult if it is not anticipated. It is of utmost importance that the public and policymakers understand the global energy crisis and act in tandem to ensure that the species 'homo sapiens' does not become extinct. Biomass is an energy source used in
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Modern civilisation is completely dependent on energy, which has therefore to be abundant and also economical. About 85% of the world's energy is supplied by oil, coal and natural gas while nuclear, hydro, wind and solar power and biomass supply the rest. Coal, nuclear and hydro are used primarily to generate electricity while natural gas is widely used for heating. Biomass is used both for heating and cooking. The wind and solar power is the future's hope as they are sustainable energy sources. Oil powers almost all machines that move and that makes oil uniquely versatile. Oil powered airplanes carry 500 people across the widest oceans at nearly the speed of sound. Oil powered machines produce and transport food. Oil powered machines are ubiquitous. Clearly, we live in the age of oil but it is drawing to a close. According to data available if oil production remains constant until it's gone, there is enough to last 42 years. Oil wells will produce less as they become depleted, which will make it impossible to keep production constant. Similarly natural gas and coal will last another 61 years and 133 years respectively. Naturally, as they become scarce, they become expensive, leading to a worldwide energy crisis. If we are to survive on this planet, we have to make a transition to sustainable energy sources. The transition may be willy-nilly or planned - the choice is ours. The dawning era of limited and expensive energy will be very difficult for everyone on earth but will be even more difficult if it is not anticipated. It is of utmost importance that the public and policymakers understand the global energy crisis and act in tandem to ensure that the species 'homo sapiens' does not become extinct. The energy sources of the future are
With respect to incident radiation, transmissivity varies with
Thermal radiation strikes a surface which has a reflectivity of 0.55 and transmissivity of 0.032. A quantity known as flux is found out to be 95 W/m 2. Determine the rate of incident flux.
Consider the following statements: 1. Absorptivity depends on wave length of incident radiation waves 2. Emissivity is dependent on wave length of incident radiation waves Which of the above statements is/are correct?
In the following question, the first and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/passage is split into four parts and named P, Q, R, S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. S1. Energy conservation refers to the efforts made to reduce the consumption of energy. P. Furthermore, energy can take plenty of time to regenerate. Q. The energy on Earth is not in unlimited supply. R. Most noteworthy, energy conservation is achievable either by using energy more efficiently or by reducing the amount of service usage. S. This certainly makes it essential to conserve energy.  S6. Energy conservation will reduce the expenses related to fossil fuels.