physics

A metal sheet of area 100cm² was heated through 70°C. Calculate its new area if the linear expansivity of the metal is 0.000017k‾¹

A. 100.06 cm² B. 100.12cm² C. 100.24cm² D. 100.36cm² Correct Answer: Option C C. 100.24cm² Explanation A2 = A1(1 +…

6 years ago

A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts.

A. 250.0s B. 25.0s C. 2.5s D. 0.5s Correct Answer: Option B B. 25.0s

6 years ago

The S.I unit of heat is?

A. joule B. kelvin C. watt D. ampere Correct Answer: Option A A. joule

6 years ago

A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving?

A. upward at uniform speed B. upward with uniform acceleration C. downward with uniform speed D. downward with uniform acceleration…

6 years ago

A resultant force of magnitude 15N acts on a body of mass 250g. Calculate the magnitude of the acceleration.

A. 0.06 ms‾² B. 3.75ms‾² C. 16.67ms‾² D. 60.00ms‾² Correct Answer: Option D D. 60.00ms‾² Explanation g = F/M =15/0.25=60

6 years ago

The tendency for a stationary body to continue to remain at rest when a force is applied to it is known as?

A. friction B. impulse C. inertia D. momentum Correct Answer: Option C C. inertia

6 years ago

A simple pendulum makes 50 oscillations in one minute. Determine its period of oscillation?

A. 0.04s B. 0.83s C. 1.20s D. 50.00s Correct Answer: Option C C. 1.20s

6 years ago

When a body is slightly titled, it is found that its centre of gravity s slightly raised. What is the state of equilibrium of the body?

A. unstable B. stable C. neutal D. cannot be detrmined Correct Answer: Option B B. stable

6 years ago

An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms‾², ignore air resistance)

A. 20m B. 40m C. 80m D. 160m Correct Answer: Option C C. 80m Explanation H = ½gt² ½×10×4²=80

6 years ago

Which of the following substances is the most volatile at room temperature?

A. water B. diesel C. petrol D. kerosine Correct Answer: Option C C. petrol

6 years ago
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