physics

On a fairly cool rainy day when the temperature is 20°C; the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40°C? [coefficient of linear expansion of steel = 11 x 10^-6K‾¹]

A. 20.013m B. 20.009m C. 20.004m D. 20.002m Correct Answer: Option C - 20.004m Explanation The increase in length of…

4 years ago

An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe; the frequency of the note is?

A. 2v/l B. v/5l C. v/4l D. v/2l Correct Answer: Option C = v/4l Explanation In vibration in a closed…

4 years ago

Thermal equilibrium between two object exist when?

A. the temperature of both objects are equal B. the quantity of heat of both objects is the same C.…

4 years ago

By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens?

A. 15.0 B. 2.5 C. 1.5 D. 0.4 Correct Answer: Option B - 2.5 Explanation Form the lens formula = 1/U + 1/V = 1/f…

4 years ago

A tuning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube; at what maximum height will resonance occur. [speed of sound in air = 340ms−¹]

A. 0.95m B. 0.60m C. 0.50m D. 0.45m Correct Answer: Option D - 0.45m Explanation In vibration in a closed…

4 years ago

If an object just begins to slide on a surface inclined at 30° to the horizontal, the coefficient of friction is?

A. √3 B. √3/2 C. 1/√2 D. 1/√3 Correct Answer: Option D - 1/√3 Explanation A body sliding down a…

4 years ago

A hose of cross-sectional area 0.5m² is used to discharge water from a water tanker at a velocity of 60ms−³ in 20s into a container. If the container is filled completely, the volume of the container is

A. 240m3 B. 600m3 C. 2400m3 D. 6000m3 Correct Answer: Option B - 600m3 Explanation Vol = cross-sectional area x…

4 years ago

A test tube of radius 1.0cm is loaded to 8.8g. If is placed upright in water; find the depth to which it would sink

A. 2.8cm B. 5.2cm C. 25.5cm D. 28.0cm Correct Answer: Option A = 2.8cm Explanation Pressure = F/A = pgh, where p…

4 years ago

On top of a spiral spring of the force constant 500Nm−¹ is placed a mass of 5 x 10−³ kg. If the spring is compressed downwards by a length of 0.02m and then released; calculate the height to which the mass is projected?

A. 8 m B. 4 m C. 2 m D. 1 m Correct Answer: Option C = 2 m Explanation…

4 years ago

A satellite is in a parking orbit if its period is?

A. less than the period of the earth B. more than the period of the earth C. equal to the…

4 years ago
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