Advertisements
Advertisements
State the condition when a body is in static equilibrium.
Concept: undefined >> undefined
State the condition when a body is in dynamic equilibrium.
Concept: undefined >> undefined
Advertisements
State two condition for a body acted upon by several forces to be in equilibrium.
Concept: undefined >> undefined
State the principle of moments. Give one device as an application of it
Concept: undefined >> undefined
The figure shows a uniform metre rule placed on a fulcrum at its mid-point O and having a weight 40 gf at the 10 cm mark and a weight of 20 gf at the 90 cm mark.
- Is the metre rule in equilibrium? If not how will the rule turn?
- How can the rule be brought in equilibrium by using an additional weight of 40 gf?
Concept: undefined >> undefined
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
Concept: undefined >> undefined
How would the sky appear when seen from the space (or moon)? Give reason for your answer.
Concept: undefined >> undefined
What characteristic property of light is responsible for the blue colour of the sky?
Concept: undefined >> undefined
The colour of sky, in direction other than of the sun, is blue. Explain.
Concept: undefined >> undefined
Why does the sun appear red at sunrises and sunset?
Concept: undefined >> undefined
The clouds are seen white. Explain
Concept: undefined >> undefined
In white light of sun, maximum scattering by the air molecular present in the earth’s atmosphere is for ______.
Concept: undefined >> undefined
What are damped vibrations? How do they differ from free vibrations? Give one example of each.
Concept: undefined >> undefined
The following diagram shows the displacement – time graph of the vibrating body.
- Name the kind of vibrations
- Give one example of such vibrations.
- Why is the amplitude of vibrations gradually decreasing?
- What happens to the vibrations of the body after some time?
Concept: undefined >> undefined
A tuning fork is set into vibration in air. Name the kind of vibrations it executes.
Concept: undefined >> undefined
Draw a sketch showing the displacement of a body executing damped vibrations against time.
Concept: undefined >> undefined
What is the ideal mechanical advantage of a single fixed pulley? Can it be used as a force multiplier?
Concept: undefined >> undefined
Name the pulley which has no gain in mechanical advantage. Explain, why is such a pulley then used?
Concept: undefined >> undefined
