An electric heater takes 6 A current from a 230 V supply line, calculate the power of the heater and electric energy consumed by it in 5 hours.

\(\frac{M_1D_1H_1}{W_1}=\frac{M_2D_2H_2}{W_2}\)  M1 = 300, D1 = 12, H1 = 8, W1 = 200 M2 = 120, D2 = ? H2 = 9, W2 = 180 \(\frac{300\times12\times8}{200}=\frac{120\times D\times7}{180}\) D = 24 days

Correct answer is (D) 100 W

Given: P = 2 kW = 2000 W, V = 300 V To find: Current (I) Formula: P = IV Calculation: From formula, I = \(\frac{P}{V}=\frac{2000}{300}\) = 6.67 A

Given: I = 6 A, V = 220 volt, t = 2 hour To find: i. Power of heater (P) ii. Electric energy consumed (E) Formulae: i. P = IV ii. Electric energy consumed =...

Correct option is: (B) 150 kWh

Answer is (B) 2, 3

Correct option is (B) 36 Total work done by 24 men in 14 days by working 6 hours a day \(=24\times14\times6\) Let x men are required to complete same work in 8 days...

Correct option is (D) 400 km Speed of the car \(=\frac{Speed}{Time}\) \(=\frac{300\,km}{6\,hours}\) = 50 km/h Distance travelled by the car in 8 hours = speed \(\times\) time = 50 km/h \(\times\) 8 hours = (50 \(\times\) 8) km = 400 km

Correct Answer - 12 hours