One light year is equal to
9.467 x 1015 m
9.467 x 1014 m
9.467 x 10 16 m
9.467 x 1010 m
In a SONAR system, the duration between sending of a search wave and receiving back of the reflected wave from an enemy submarine is 77s.If speed of sound in water is 1450 m/s,find the distance of the energy submarine.
55.8 km
65.8 km
52.8 km
62.8 km
Candela is the unit of
temperature
electric potential
luminous intensity
energy
Which of the following is a more accurate measuring instrument?
Metre Scale
Vernier Calipers
Screw Gauge
Both Screw Gauge and Vernier Calipers
A student measures the thickness of a human hair with the help of a microscope of magnification 100.He takes 20 readings and find average field of view of microscope as 3.5 mm.What is the thickness of the hair?
0.35 m
0.035 m
0.0035 m
none of these
The units of length, mass and time are called
S.I. Units
C G S Units
Fundamental Units
Derived Units
One mole of an ideal gas at standard temperature and pressure occupies 22.4 L (molar volume).What is the ratio of molar volume to the atomic volume of a mole of hydrogen ?(Take the size of hydrogen molecule to be about 1 Å).
7 x 104
7 x 105
7 x 10-4
7 x 10-5
How many wavelength of Kr86 are there in one meter?
1650763.73
1560763.73
1065763.73
1560736.73
Who formulated the laws of planetary motion?
Issac Newton
Johannes Kepler
Tycho Brahe
Albert Einstein
In an experiment the angles are required to be measured using an instrument.29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale.If the smallest division of the main scale is half - a - degree (= 0.5°), then the least count of the instrument is
one minute
half minute
one degree
half degree
