Q. Mosquito repellents contain mainly :
A) calcium dihydrogen phosphate  
B)  potassium hydrogen phosphate  
C) sodium hydrogen sulphate  
D) ammonium bicarbonate
Q. when a charged particle moves in a transverse magnetic field, it path of motion is
A) parabolic
B) circular
C) elliptical
D) linear
Q. Boundary line between Pakistan and India
A)  Radcliffe line  
B) Durand line  
C) Maginot line  
D) McMahon line
Q. Ammonia gas is used as a coolant in
A)  air cooler  
B)  air conditioners  
C) refrigerators  
D) water heaters
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 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. Tea will cool most easily in :
A) glass cup  
B) metal cup
C) clay cup  
D) porcelain cup
Q. the most suitable unit for expressing nuclear radius is
A) micron
B) nanometer
C) Fermi
D) angstrom
Q. An ideal gas engine operates in a carnot cycle. it absorbs heat at a temperature T1 and exhaust heat at T2. the efficiency of this engine is
A) (T1-T2)/T1
B) (T1+T2)/T1
C) (T1-T2)/T2
D) T1/T2
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
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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