The slope of the straight line displacement-time graph indicates?
A. distance traveled B. uniform velocity C. uniform acceleration D. uniform speed Correct Answer: Option B = uniform velocity Explanation △s/△t = uniform velocity
The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40%; then the value of W is
A. 28.0N B. 48.0N C. 288.0N D. 50.0N Correct Answer: Option D = 50.0N Explanation V.E = 6, load = 120N Efficiency = M.A x 1/V.R x 100% 40 = 120/effort x 1/6 x 100/1 Effort = 50N
Heat is supplied uniformly at the rate of 100W to 1.0 x 10¯²kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5°C; then the specific heat capacity of the liquid is
A. 2.0 x 102Jkg−1K−1 B. 2.0 x 102Jkg−1 C. 4.0 x 104Jkg−1K−1 D. 4.0 x 104Jkg−1 Correct Answer: Option C = 4.0 x 104Jkg−1K−1 Explanation Heat energy = Electrical Energy MCθ = power x time 5 x 1 x 10−2 x C = 100 x 20 C = 200/5×102 = 4 x 104 Jkg−1K−1...
The lower and upper fixed points marked on a Mercury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
A. 55.3°C B. 23.3°C C. 49.0°C D. 16.43°C Correct Answer: Option B = 23.3°C Explanation 49−0/210−0 = θ−0/100−θ 49/210=θ/100 49 x 100 = 210 x θ Θ = 4900/210 = 23.3o
In which of the following diagrams is the length of the tube equal to one wavelength?
A. a B. b C. c D. d Correct Answer: Option C = cProducts
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