Q. If the universal gravitational constant were decreasing with time, then satellite in orbit would still maintain its
A) Orbital radius
B) Angular momentum
C) Tangential speed
D) period of revolution
Q. The land of midnight sun is
A) Norway
B) Italy
C)  Russia
D) Belgium
Q. an electric or magnetic field cannot accelerate
A) electrons
B) protons
C) neutrons
D) alpha particles
Q. in a halfwave rectifier the rms valve of the a.c component of the wave is
A) greater than d.c value
B) less than d.c value
C) equal to d.c value
D) zero
Q. an electron moves with a constant velocity V parallel to the direction of uniform magnetic field B. the force experienced by the electron is
A) BeV
B) eV/B
C) B/eV
D) zero  
Q. A said to B, " I am thrice as old as you were when i was of your age. "Find the present age of A if sum of their ages is 30
A) 12
B) 18
C) 24
D) 22.5
Q. Thermonic emission was discovered by
A) Thomas Edison
B) lee de forest
C) fleming
D) Rutherford
Q. Mosquito repellents contain mainly :
A) calcium dihydrogen phosphate  
B)  potassium hydrogen phosphate  
C) sodium hydrogen sulphate  
D) ammonium bicarbonate
Q. Plants that grow in seashores are called as :
A) Halophytes  
B) Hydrophytes  
C)  Xerophytes  
D) Psammophytes
Q. Tea will cool most easily in :
A) glass cup  
B) metal cup
C) clay cup  
D) porcelain cup
Today Challenging Question
Q. If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream ?
A) 13 km/hr
B) 26 km/hr
C) 34 km/hr
D) none of these
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