Physics WAEC - Page 54 of 259

A tap supplies water at 26°C while another supplies water at 82°C. If a man wishes to bathe with water at 40°C the ratio of hot mass of hot water to that of cold water required is?

A. 1:3 B. 3:1 C. 3:7 D. 7:3 E. 15:8 Correct Answer: Option A – 1:3 Explanation heat supplied by hot water = heat gained by cold water M1C(82 – 40) = M2C(40 – 26) M2/M1= 14/42 = 1:...

A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady steady state, the steam trap

by Sunday | Aug 31 | Physics WAEC

A. stores the steam for future use B. prevents the steam from escaping C. ensures that only dry steam gets into the calorimeter D. allows condensed steam to go into the calorimeter E. determine the quantity of steam used Correct Answer: Option C – ensures that...

The boiling point of a liquid depends on the following except the?

by Sunday | Aug 31 | Physics WAEC

A. nature of the liquid B. external pressure C. volume of the liquid D. impurities present in the liquid E. degree of it’s molecular cohesive force Correct Answer: Option C – volume of the liquid

A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?

by Sunday | Aug 31 | Physics WAEC

A. west B. east C. north-west D. north-east E. south-west Correct Answer: Option C – north-west

The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W

by Sunday | Aug 31 | Physics WAEC

A. 300N B. 200N C. 140N D. 120N E. 20N Correct Answer: Option D – 120N Explanation Eff = MA/VR x 100% 40 = MA/60 MA = 240 LE=240/100 W = L = (240 x 50)/100 =...

The product PV where P is pressure and V is volume has the same unit as?

by Sunday | Aug 31 | Physics WAEC

A. power B. work C. acceleration D. impulse E. force Correct Answer: Option B – work Explanation P = N/m² V = m PV = Nm unit of work

A tap supplies water at 26°C while another supplies water at 82°C. If a man wishes to bathe with water at 40°C the ratio of hot mass of hot water to that of cold water required is?

A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady steady state, the steam trap

The boiling point of a liquid depends on the following except the?

A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?

The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W

The product PV where P is pressure and V is volume has the same unit as?

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