![The pressure of two moles of an ideal gas at a temperature of 27°C and volume 10‾²m³ is? [R = 8.313 J mol‾¹K‾¹]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
What is the frquency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25s?
A. 0.01 Hz B. 0.04 Hz C. 2.27 Hz D. 3.60 Hz Correct Answer: Option D – 3.60 Hz Explanation Frequency = (No. of revolutions)/ Time = (90)/25 = 3.6 Hz
which of the below conditions must hold for a body acted upon by a system of three coplanar forces equilibrium?
I. All the three forces must be concurrent. II. The upward force is equal to the downward force. III. The algebraic sum of the moment about any point must be zero. A. I and II only B. I and III only C. II and III only D. I, II and III Correct Answer: Option B = I and...
If a wheel 1.2 m in diameter rotates at one revolution per second; calculate the velocity of the wheel.
A. 3.6 ms‾¹ B. 3.77 ms‾¹ C. 4.0 ms‾¹ D. 7.5 ms‾¹ Correct Answer: Option B = 3.77 ms‾¹ Explanation V = wr = 2πfr = 2 x (22)/7 x 1 x 0.6 = 3.77ms‾¹
Which of the following is NOT a vector quantity _____?
A. altitude B. acceleration C. displacement D. weight Correct Answer: Option A = altitude Explanation Altitude is just a measure of height, regardless of direction.
Which of the below are the correct S. I units of the quantities indicated?
I. Force (N) II.Torque (Nm) III. Current (A) IV. Power (W) A. I and II only B. I and III only C. I, II and III only D. I, II, III and IV Correct Answer: Option D – I, II, III and IV Explanation Torque has the same unit as moment = Nm ∴i, iii and iv have correct...Products
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