physics

A battery of emf 24V is connected to three resistors P, Q and R as illustrated in the diagram. Determine the voltage across the resistor Q.

A. 5v B. 10v C. 14v D. 24v Correct Answer: Option B Explanation E - V1 + V2 24V =…

6 years ago

A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]

A. 200g B. 320g C. 400g D. 500g Correct Answer: Option D D. 500g Explanation Heat lost by hot water…

6 years ago

The diagram above illustrates a block and tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E.

A. 22.2N B. 38.0N C. 67.0N D. 75.0N Correct Answer: Option A A. 22.2N

6 years ago

Water is unsuitable for use as a thermometric liquid because of its?

A. expands unevenly between 0ºC and 40ºC B. has a narrow temperature range C. has a concave meniscus D. maintains…

6 years ago

The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of?

A. thermal equilibrium of the sheets B. conduction of heat by the sheets C. contraction of the sheets D. expansion…

6 years ago

A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground. [g = 10ms‾²]

A. 10J B. 10³J C. 10^4J D. 10^5J Correct Answer: Option D Explanation Ke = mgh Ke = Pe ½MV²…

6 years ago

A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.

A. 133.2g B. 66.0g C. 60.0g D. 22.0g Correct Answer: Option B B. 66.0g Explanation clockwise movement = anticlockwise movement…

6 years ago

A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms‾²]

A. 500.0ms‾¹ B. 100.0ms‾¹ C. 70.0ms‾¹ D. 50.0ms‾¹ Correct Answer: Option B Explanation V² = U² + 2gs V² =…

6 years ago

In a school compound, a girl walks 40km due east from the laboratory to the staff room to submit her report. Then she returns and walks 30m due north to her classroom. Determine the magnitude of her displacement from the 10m laboratory?

A. 10m B. 35m C. 50m D. 70m Correct Answer: Option C C. 50m

6 years ago

Which of the following statements describes a body in a stable equilibrium correctly?

A. a person walking on a tight-rope B. ball on a smooth horizontal table C. ball resting on an inverted…

6 years ago
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