Multiple Choice QuestionsWhich one of the following statements about a satellite orbiting around the Earth is correct?
Satellite is kept in orbit by remote control from ground station.
Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the Earth.
Satellite requires energy from solar panels and solid fuels for orbiting.
Satellite does not require any energy for orbiting.
Which one of the following statements about energy is correct?
Energy can be created as well as destroyed.
Energy can be created but not destroyed.
Energy can. neither be created nor destroyed.
Energy cannot be created but can be destroyed.
Step-up transformers are used for:
increasing electrical power
decreasing electrical power
decreasing voltage
increasing voltage
Which one among the following waves carries the maximum energy per photon?
X-rays
Radio waves
Light waves
Microwave
A rainbow is produced due to which one of the following phenomena?
Dispersion of light
Interference of light
Diffraction of light
Scattering of light by atmospheric dust
Bats -detect obstacles in their path by receiving the reflected:
Infrasonic wave
Ultrasonic waves
Radio waves
Microwaves
The statement that 'heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature', is known as
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
Which one of-the following waves does not belong to the category of the other three?
X-rays
Micro waves
Radio waves
Sound waves
Which one of the following statements is not correct?
Human eye is a refracting system containing a diverging lens.
The retina of the human eye contains millions of light sensitive cells, called rods and cones, which convert the light into electrical messages.
Every image that is focused on the retina is upside down
We need both eyes to judge the relative positions of objects accurately.
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