A quantity of water at 0 °C is heated to 30 °C. For each degree rise in temperature, its density will?

3 years ago

A. rise steadily B. fall steadily C. fall and then rises D. rise and then falls Correct Answer: Option B…

The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800N. If the mass of the car is 1220 kg, determine the distance the car has to travel from the rest before acquiring a speed of 4 m s−1.

3 years ago

A. 44.0 m B. 22.2 m C. 11.1 m D. 5.5 m Correct Answer: Option B - 22.2 m

Which of the folowing statements about light travelling from one material medium to another is not correct?

3 years ago

A. The refracted angle is less than the incident angle if the speed is higher in the first material A.…

Which of the following concepts is a method of heat transfer that does not require a material medium?

3 years ago

A. Conduction B. Diffusion C. Convection D. Radiation Correct Answer: Option D - Radiation Explanation Radiation is energy that comes…

The diameter of a brass ring at 30 °C is 50.0 cm. To what temperature must this ring be heated to increase its diameter to 50.29 cm? [ linear expansivity of brass = 1.9 x 10−5 K−1]

3 years ago

A. 152.6 °C B. 182.6 °C C. 306.1 °C D. 335.5 °C Correct Answer: Option A = 152.6 °C

Which of the following statements-about electromagnetic waves is not correct?

3 years ago

A. They carry energy as they travel through space B. They travel with the speed of light C. They are…

The distance between the fixed points of a mercury-in-glass thermometer is 30 cm. Determine the temperature when the mercury level is 10.5 cm above the lower fixed point

3 years ago

A. 28.6ºC B. 30.0 ºC C. 35.0 ºC D. 40.5 ºC Correct Answer: Option C = 35.0 ºC

A hunter fires a gun at a point 408 m away from a cliff. If he hears an echo 2.4 s later; determine the speed of the sound wave

3 years ago

A. 340 ms−1 B. 380 m s−1 C. 400 m s −1 D. 680 m s−1 Correct Answer: Option A…

When the direction of vibration of the particles of a medium is perpendicular to the direction of propagation of a wave; the wave is said to be?

3 years ago

A. longitudinal B. transverse C. mechanical D. a sound wave Correct Answer: Option B - transverse Explanation In physics, a…

The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take 78 of the sample to decay

3 years ago

A. 15 hours B. 30 hours C. 45 hours D. 60 hours Correct Answer: Option C - 45 hours

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