Q. Superposition of two waves trains of amplitudes and nearly same frequiencies, moving in the same direction, results in the formation of beats. The maximum loudness heard at the waxing is 'n' times the loudness of each of the componet wave trains. the value of n is
A) 1
B) 2
C) 4
D) 8
Q. Worker W produces n units in 5 hours. Workers V and W, workers independently but at the same time, produce n units in 2 hours. how long would it take V alone to produce n units?
A) 1 hr 26 min
B) 2 hr 30 min
C) 3 hr 30 min
D) 3 hr 20 min
Q. The second law of thermodynamics introduces the concept of
A) Heat
B) Temperature
C) Entropy
D) Internal energy of the system
Q. the present ages of A and B are 2:5. nine years ago their ages were in the ratio 1:4. find the present age of A
A) 18
B) 20
C) 22
D) 24
Q. The saturation current in diode valve depends upon
A) plate voltage
B) temperature of the filament
C) neither a nor b
D) both a and b
Q. An electron of mass M kg and charge ‘e’ columbs travel from rest through a potential difference of V volts. The field energy of electron in joule is
A) MeV
B) eV/M
C) eV
D) e/V
Q. Plants that grow in seashores are called as :
A) Halophytes  
B) Hydrophytes  
C)  Xerophytes  
D) Psammophytes
Q. Mosquito repellents contain mainly :
A) calcium dihydrogen phosphate  
B)  potassium hydrogen phosphate  
C) sodium hydrogen sulphate  
D) ammonium bicarbonate
Q. an electric or magnetic field cannot accelerate
A) electrons
B) protons
C) neutrons
D) alpha particles
Q. . How many members can president of india nominate to rajya sabha
A)  9  
B)  10  
C)  11  
D)  12
Today Challenging Question
Q. find the compound interest on Rs.50000 at 16% per annum for 2 yrs, compounded anually
A) 17280
B) 17000
C) 17500
D) 17300
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