physics

In a good thermos flask; the main cause of heat loss is?

A. conduction through the cork B. the plastic base of the thermos flask C. the silvered walls and shiny metals…

4 years ago

A sealed flask contains 600cm³ of air at 27°C and is heated to 35°C at constant pressure. The new volume is?

A. 508 cm³ B. 516 cm³ C. 608 cm³ D. 616 cm³ Correct Answer: Option D = 616 cm³ Explanation…

4 years ago

During summer; the balance wheel of a clock expands. What effect does this have on the accuracy of the clock?

A. the clock gains time B. the accuracy of the clock is not affected C. the clock losses time D.…

4 years ago

The thermometric properties of a thermocouple is the change in?

A. equivalent resistance B. electromotive force C. colour D. pressure Correct Answer: Option B Explanation Temperature difference between hot and…

4 years ago

An empty density bottle weighs 2N. If its weighs 5N when filled with water and 4N when filled with olive oil; the relative density of olive oil is?

A. (1)/3 B. (2)/3 C. (1)/5 D. (2)/5 Correct Answer: Option B = (2)/3 Explanation relative density = (weight of…

4 years ago

When cold water is poured on a can containing hot water; the can collapses because the?

A. steam condenses and occupies the partial vacuum in the can B. external air pressure counterbalances the pressure within the…

4 years ago

A spring of force constant 500 Nm‾¹ is compressed such that its length shortens by 5cm. The energy stored in the spring is?

A. 0.625 J B. 6.250 J C. 62.500 J D. 625.000 J Correct Answer: Option A - 0.625 J Explanation…

4 years ago

A motorcycle of mass 100kg moves round in a circle of radius 10m with a velocity of 5 ms‾¹. Find the coefficient of friction between the road and the tyres.

A. 25.00 B. 2.50 C. 0.50 D. 0.25 Correct Answer: Option D - 0.25 Explanation F = (mv²)/r = (100…

4 years ago