Please select a subject first
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Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
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For a fuse, higher the current rating ________ is the fuse wire.
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Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals
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State an additional use of the X-rays waves
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Draw a simplified diagram of a lemon crusher, indicting of load and effort
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When does a force do work?
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A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
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A wave has wavelength 50 Å.
- Name the wave.
- State its speed in vacuum.
- State its one use.
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Two copper wires are of the same length, but one is thicker than the other. Which wire will have more resistance?
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How is the unit horsepower related to the S.I. unit of power?
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A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.
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What do you mean by an equilibrium of a body?
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State the condition when a body is in static equilibrium.
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State the condition when a body is in dynamic equilibrium.
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State two condition for a body acted upon by several forces to be in equilibrium.
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State the principle of moments. Give one device as an application of it
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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?
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State the condition when the work done by a force is positive. Explain with the help of examples.
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A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
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When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
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