physics

500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200Jkg−1K−1

A. 9000J B. 12600J C. 21000J D. 25200J E. 88200J Correct Answer: Option B - 12600J

5 years ago

A body accelerates uniformly from rest at 2ms−². Calculate the velocity after traveling 9m

A. 36m/s B. 18m/s C. 6m/s D. 4.5m/s E. 4.24m/s Correct Answer: Option C - 6m/s

5 years ago

A cell of e.m.f. 1.5V and internal resistance of 2.5Ω is connected in series with an ammeter of resistance 0.5W and a resistor of resistance of 7.0Ω. Calculate the current in the circuit.

A. 0.15A B. 0.20A C. 2.10A D. 3A E. 6.6A Correct Answer: Option A - 3A

5 years ago

A note of frequency of 2000Hz has a velocity of 400ms−1. What is the wavelength of the note?

A. 800m B. 200m C. 5m D. 2m E. 0.2m Correct Answer: Option E - 0.2m Explanation λ=v/f=400/2000=0.2m

5 years ago

The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

A. 330 B. 238 C. 146 D. 119 E. 73 Correct Answer: Option C - 146 Explanation 238 - 92…

5 years ago

In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material

A. 0.75 days B. 2.58 days C. 4 days D. 4.80 days E. 6 days Correct Answer: Option D -…

5 years ago

When an atom loses or gains a charge, it becomes an?

A. ion B. an electron C. a neutron D. a proton E. a deuteron Correct Answer: Option A - an…

5 years ago

Which of the following substances is not an insulator?

A. Aluminium B. Glass C. Plastic D. Clay E. Cork Correct Answer: Option A - Aluminium

5 years ago

A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire

A. 180Ω B. 27Ω C. 3Ω D. 1.3Ω E. 0.8Ω Correct Answer: Option E - 0.8Ω Explanation R = V/I=12/15…

5 years ago

This is a description of?

A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the…

5 years ago
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