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একটি কণা t = 0 সময়ে স্থির অবস্থা থেকে যাত্রা শুরু করে। কণাটির ওপর প্রযুক্ত লব্ধি বল, সময় t এর সমানুপাতিক। কণাটির গতিশক্তি নিচের কোনটির সমানুপাতিক হবে? (A particle starts from rest at t = 0. The net force acting on the particle is proportional to time t. Its kinetic energy is proportional to which one of the following?)
A t2
B t3
C t
D t4
The ratio of the number of teeth to the pitch circle diameter in millimeters, is called
A circular pitch
B diametral pitch
C module
D none of the mentioned
The ratio of pitch circle diameter in millimeters to the number of teeth, is called
A Circular pitch
B Diametral pitch
C Module
D None of these
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.
A Smallest
B Largest
C Either A or B
D Neither A nor B
The potential energy of a particle falling through a straight shaft drilled through the earth (assumed homogenous and spherical) is proportional to (where r is the distance of’the particle from centre of the earth)
A log r
B r
C r2
D $$\frac{1}{{\text{r}}}$$
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
A Sphere
B Cube
C Cylinder (L/D = 1)
D Raschig rings
Three maths classes: X, Y, and Z take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and the average score of class Y and Z is 81. What is the average score of the combined classes X, Y, and Z?
A 81
B 81.5
C 82
D 84.5
Three math classes , X, Y , and Z, take an algebra test. The average score in class X is 83. The average score in class Y is 76. The average score in class Z is 85. The average score of all students in classes X and Y together is 79. The average score of all student classes Y and Z together is 81. What is the average for all the three classes?
A 81
B 81.5
C 82
D 84.5
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
A Jaw crusher, Ball mill, Fluid energy mill
B Ball mill, Jaw crusher, Fluid energy mill
C Fluid energy mill, Jaw crusher, Ball mill
D Fluid energy mill, Ball mill, Jaw crusher
Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.
A 2 to 3
B 0.01 to 0.10
C 200 to 300
D 100 to 1000

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