Which of the following is a more accurate measuring instrument?
Metre Scale
Vernier Calipers
Screw Guage
Both screw guage and vernier calipers
The unit of energy in SI system is:
electron volt
calorie
joule
erg
What is the distance in km of a quasar (farthest heavenly bodies) from which light takes 3 billion years to reach us?
2.8 x 1012 km
2.8 x 1022 km
3.8 x 1022km
3.72 x 1022 km
The density of a cube is measured by measuring its mass and length of its sides.If the maximum error in the measurement of mass and length are 4% and 3% respectively,the maximum error in the measurement of density will be
7%
9%
12%
13%
1 pc =
3.08 x 1016 m
3 x 1016 m
3.08 x 10-16 m
3 x 10-16 m
In a vernier callipers, one main scale division is x cm and n divisions of the vernier scale coincide with (n -1) divisions of the main scale.The least count (in cm ) of the callipers is :
(n - 1/ n)x
nx / (n -1)
x / n
x / (n -1 )
Which of the following ratios is dimensionless?
Work/Power
Work/ Energy
Momentum / Power
Momentum/Energy
The dimensional formula of angular momentum is
MLT-2
ML-1T-
M1L2T-1
MLT-1
A satellite is moving on a circular path of radius r around the earth has a time period T.If its radius slightly increases by Δr,the change in its time period is
3/2(T/r)Δr
2/3(T/r)Δr
3/2(T2/r2)Δr
None of these
How many amu would make up 1 kg
6. 024x 1026 amu
1.6x1017 amu
9.11x 1027 amu
8.852x10 12amu
