Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
The SI unit of work function of a metal used in photoelectric effect is
joule (J)
newton (N)
pascal (Pa)
hertz (Hz)
The SI unit of momentum is ________.
Kg-m/s
Kg-m/s2
Kg2-m/s2
Kg-m2/s
Parallax angle less than 0.01 arcsec are very difficult to measure from Earth due to the-
varying light intensity from Sun
larger distances between Earth and other celestial bodies
inaccuracy of measurement in vacuum of outer space
effects of the Earth's atmosphere
Light-year is a unit of-
Temperature
Length
Mass
Time
Which one of the following methods is used to measure the distance of a planet or a star from the earth?
Triangulation method
Parallax method
Echo method
All of the above
The incorrect unit conversion among the following is
1 light year = 9.46 × 1015 m
1 fermi = 10-15 m
1 angstrom = 1010 m
The distance of a planet from the earth is about 78 times the radius of the earth. What will be diameter of the earth as seen from the planet?
2.30∘
1.47∘
3.32∘
4.12∘
The limitation in using an optical microscope for measuring small dimensions is-
extremely small objects cannot be focused by the microscope
it can only measure length along one direction
the wave nature of light cannot help resolve smaller particles
none of the above
An astronomical unit is defined as-
average distance between centre of Earth and centre of Moon
average distance between centre of Sun and centre of Moon
average distance between centre of Earth and Pole star
average distance between centre of Earth and centre of Sun
Which of the following correctly defines the 'absolute error'?
arithmetic mean of all the errors
magnitude of the difference between the individual measurement and the true value
difference between the individual measurement and the true value
None of the above
In the measurement of period of oscillations of a pendulum. The unit of absolute error and relative error are _________ and _________ respectively.
second, second
no unit, no unit
unitless, second
second, unitless
The quantity that does not have mass in its dimension is:
Electrical potential
Electrical resistance
Specific heat
Magnetic flux
If coulomb is also a fundamental quantity with dimension [C], then the dimensions of magnetic field strength is-
[M1T-2C-1]
[M1T-1C-1]
[M2T-1C1]
[M1T2C2]
Pressure is measured in terms of
Mass & Density
Work done
Force and Area
Force and Distance
The square root of the product of inductance and capacitance has the dimension of ______
length
mass
time
no dimension
