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Browse complete papersA semi-circular lamina with a radius r = 30 mm is shown in the figure. The location of the centroid G of the lamina with respect to the axis passing through the diameter (OX) is at a distance of _____ mm.
40 π
\(\frac{{30}}{\pi }\)
30π
\(\frac{{40}}{\pi }\)
Correct answer
40 π
A block of weight 500 N resting on a horizontal surface is subjected to a horizontal push of 600 N force, calculate the coefficient of static friction at the contact surface between two materials, if the limiting friction force developed is 200 N.
0.5
0.2
0.4
0.3
Correct answer
0.5
Four concurrent forces are acting at a point O as shown in figure. What would be the component of the resultant force in the X direction?
450 N
400 N
350 N
300 N
Correct answer
450 N
As per IS 10500 : 2012, permissible limit for the turbidity of drinking water in the absence of alternate source is ______.
5 NTU
10 NTU
1 NTU
3 NTU
Correct answer
5 NTU
Two solutions of a substance (non electrolyte) with a different values of molarity (M) are mixed, volume of first solution is 400 mL with 1.5 M and volume of second solution is 500 mL with 1 M second solution. Calculate the molarity of the final mixture?
1.56 M
1.39 M
1.22 M
0.95 M
Correct answer
1.56 M
The arithmetic mean between two numbers is 75 and their geometric mean is 21. Find the numbers.
73 and 77
63 and 87
3 and 147
133 and 17
Correct answer
73 and 77
Consider the below statements with respect to dissolved oxygen and temperature and identify correct answer.
Statement A : Cold water can hold more dissolved oxygen than warm water.
Statement B : Dissolved-oxygen concentration is independent of temperature of water.
Statement A is correct and B is incorrect
Both statements are correct
Both statements are incorrect
Statement B is correct and A is incorrect
Correct answer
Statement A is correct and B is incorrect
Consider the below statements with respect to Kirchoff's Law and identify the correct answer.
Statement A: At any node (junction) in a circuit the product of currents entering and leaving a node at any instant of time must be equal to zero.
Statement B: In a closed circuit, the algebraic sum of all source voltages must be equal to the algebraic sum of all the voltage drops.
Both statements are incorrect
Statement A is correct and B is incorrect
Statement B is correct and A is incorrect
Both statements are correct
Correct answer
Both statements are incorrect
Consider the below statements with respect to the series circuit and Identify the correct answer.
Statement A: The same current flows through each resistor in series.
Statement B: In a series circuit, the voltage drops across each resistor will be directly proportional to the capacity of the resistor.
Statement B is correct and A is incorrect
Statement A is correct and B is incorrect
Both statements are incorrect
Both statements are correct
Correct answer
Statement B is correct and A is incorrect
Pitting corrosion in metals is a ______.
Metallurgically influenced corrosion
Localized corrosion
General corrosion
Uniform corrosion
Correct answer
Metallurgically influenced corrosion