Related Questions

The safe speed for a train rounding a corner is proportional to the square root of the radius . If the safe speed for a curve of radius 49 meters is 28 km/h. The safe speed for a curve of radius 64 metes is :
A (256/7)km /h
B (256/7) km /h
C 32 km /h
D 23 km /h
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 rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
A Lewis-Randall rule
B Statement of Vant-Hoff equation
C Le-Chatelier's principle
D None of these
If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?
A $$\left( {A + B} \right)\alpha \,C$$
B $$\left( {A - B} \right)\alpha \,\frac{1}{C}$$
C $$\sqrt {AB} \,\alpha \,C$$
D $$\frac{A}{B} = {\text{constant}}$$
The respective ratio between the speed of a speed of the car, bus and train is 5 : 9 : 6. The average speed of the car, bus and train is 72 km/hr together. What is the average speed (km/h)of the car and the train together?
A 82
B 72
C 67
D 84
Response of a system to a sinusoidal input is called __________ response.
A Impluse
B Unit step
C Frequency
D None of these
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)
A $$\frac{1}{{\sqrt {\text{M}} }}$$
B $$\sqrt {\text{M}} $$
C $$\frac{1}{{\text{M}}}$$
D M
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature )
A $$\frac{1}{{\sqrt {\text{T}} }}$$
B $$\frac{1}{{\text{T}}}$$
C $$\sqrt {\text{T}} $$
D T
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
A N°
B N1
C N2
D N3
A train went 300 miles from city X to city Y at an average speed of 80 miles per hours ( mph ). At what speed did the train travel on the way back if its average speed for the whole ( both ways ) trip was 100 mph?
A 120 mph
B 125 mph
C 133.33 mph
D 137 mph

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