A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
A. 0.02s B. 0.20s C. 0.83s D. 1.20s E. 50.00s Correct Answer: Option D – 1.20s Explanation T = t/no. of oscillation = 1 x 60/50 = 1.2s
A girl whose mass is 55kg stands on a spring-weighing machine inside a lift. When the lift starts to ascend its acceleration is 2ms1. What will be the reading on the machine? (Take g = m/s²)
A. 66 kg B. 55 kg C. 44 kg D. 22 kg E. 11 kg Correct Answer: Option A – 66 kg Explanation Reading = mg + ma = m(g + a) = 55(10 + 2) = 660N = 66kg
A plane inclined at an angle at 30° to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is?
A. 40√3N B. 60N C. 120N D. 200N E. 240N Correct Answer: Option C – 120N Explanation E = M.A/V.R ; 50/100 = M.A/2 M.A = 1; L/E = 1 E = L = 120N
Which of the following are contact forces?
I. Force of tension II. Force of friction. III. Magnetic force III Force of reaction. A. I,II and III only B. I, II and IV only C. I, III and IV only D. II, III and IV only E. l and IV only. Correct Answer: Option B – I, II and IV...
Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?
A. metre rule B. A pair of calipers C. A micrometer screw gauge D. A tape rule E. A set square Correct Answer: Option B – A pair of calipersProducts
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