Physics WAEC Past Questions

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2261

The law of conservation of momentum is stated for closed and isolated system. What are the two conditions for a system to be closed and isolated?

A. No external force acts on the system and there is no change in mass of the system.
B. No external force acts on the system and there is a gain in mass.
C. No external force acts on the system and there is a loss in mass.
D. An external force acts on the system and there is no change in mass.

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2262

A stone of mass 200 g attached to a string is made to revolve in a horizontal circle of radius 1.5 m at a steady speed of 5 m/s. Calculate the tension in the string at the bottom of the circle.

A. 5.3 N
B. 3.3 N
C. 2.0 N
D. 1.3 N

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2263

To convert a milli-ammeter to an ammeter, a resistor of low value is necessary to connect a resistor of

A. low value in series with it
B. high value in series with it
C. low value in parallel with it
D. high value in parallel with it

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2264

An object is placed 1.5 m from a plane mirror. How far is the image from the object?

A. 3.0 m
B. 1.3 m
C. 1.0 m
D. 0.3 m

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2265

Chromatic aberration in lenses can be corrected by using a combination of

A. diverging and converging lenses.
B. an opaque material to cover the rims of lenses.
C. wide parallel beams on the lenses' surface.
D. a thin convex lens.

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