![An electric heater rated 220V; 1000W is immersed into a bucket full of water; calculate the mass of water if the temperature changes from 30°C to 100°C and the current flows for 300seconds. [specific heat capacity of water = 4200 jkg‾¹K‾¹]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
by Sunday | Nov 9 | Physics JAMB
A. 4.28 kg B. 42.86 kg C. 1.02 kg D. 7.14 kg Correct Answer: Option C = 1.02 kg Explanation Energy supplied bythe heater = heater gained by water pt = MCAθ 1000 x 300 = m x 4200(100 – 30) m = (1000 x 300)/4200 x 70 = 1.02...
by Sunday | Nov 9 | Physics JAMB
A. constant B. minimum C. maximum D. zero Correct Answer: Option B – minimum Explanation Anomalous expansion of water is at temperature ranges 0°C to 4°C. water contract when heated from 0°c to 4°c. thus the volume of water is least at...
by Sunday | Nov 9 | Physics JAMB
A. bi-metallic strip thermometer B. thermocouple C. platinum resistance thermometer D. optical pyrometer Correct Answer: Option D – optical pyrometer Explanation A pyrometer is an instrument for measuring high temperatures. The optical pyrometer is one in which...
by Sunday | Nov 9 | Physics JAMB
A. 1400 kgm‾³ B. 1250 kgm‾³ C. 500 kgm‾³ D. 1000 kgm‾³ Correct Answer: Option B – 1250 kgm‾³ Explanation Weight of glycerine displaced = weight of water displaced Mgh glycerine = Mgh water Pvgh glycerine = Pvgh water 0.4V P glycerine = (0.5v)/v.4v P water = 1.25...
by Sunday | Nov 9 | Physics JAMB
A. 6.0 x 10‾²J B. 7.6 x 10‾²J C. 1.8 x 10‾²J D. 6.6 x 10‾²J Correct Answer: Option A = 6.0 x 10‾²J Explanation Work done on a stretched cord = Average force x extension = (10 + 0)/2 x 1.2 x 10‾² = 6.0 x...
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
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