Define the power of a lens.
Concept: Refraction at Spherical Surfaces and by Lenses > Power of a Lens
What do you understand by the term Scattering of light?
Concept: Some Natural Phenomena Due to Sunlight
Why does sun appear red at sunrise and sunset?
Concept: Some Natural Phenomena Due to Sunlight
Which particles are responsible for current in conductors?
Concept: Electrical Energy and Power
To which wire of a cable in a power circuit should the metal case of geyser be connected.
Concept: Household Circuits - Earthing;
To which wire should the fuse be connected?
Concept: Household Circuits - Fuses
State two characteristics of a good thermion emitter.
Concept: Latent Heat
State two characteristics of a good thermion emitter.
Concept: Latent Heat
Why is a jack screw provided with a long arm?
Concept: Work
Why is a jack screw provided with a long arm?
Concept: Work
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
Concept: Work, Energy, Power - Relation with Force
A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions
1) Is the stone moving with a uniform or variable speed?
2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
3) What kind of force acts on the hand and state its direction?
Concept: Work, Energy, Power - Relation with Force
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
Concept: Work, Energy, Power - Relation with Force
How is work done by a force measured when the force is in the direction of displacement?
Concept: Work, Energy, Power - Relation with Force
How is work done by a force measured when the force is in an angle to the direction of displacement?
Concept: Work, Energy, Power - Relation with Force
Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s. Calculate the power exerted.
Concept: Work, Energy, Power - Relation with Force
Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
Concept: Work, Energy, Power - Relation with Force
Name a common device where a gear train is used
Concept: Work
Name a common device where a gear train is used
Concept: Work
Draw a simplified diagram of a lemon crusher, indicting of load and effort
Concept: Work, Energy, Power - Relation with Force
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