NEET Physics Units And Measurement Class 11 Questions

If the unit of force is 100 N, unit of length is 10 m and unit of time is 100 s, what is the unit of mass in this system of units?

1 kilowatt hour (kWh) is equal to

Tick the incorrect statements? (1) For the formula radius = diameter/2, the factor 2 has infinite significant figures. (2) Keeping the significant figures in view, the sum of the physical quantities and 0.123 m is 205.3 m. (3) Keeping the significant figures in view, the radius of a circle is stated as 2.12 cm. Its area should be written as 14.11 cm². (4) 2.745 rounded off to three significant figures becomes 2.74.

In an experiment to find out the diameter of wire using screw gauge, the following observation were noted:

The speed of light in vacuum is taken as unity. If light takes 6 min 40 s to reach the Earth from the Sun, the distance between the Sun and the Earth in new unit is:

Each side of a metallic cube of mass 5.580 kg is measured to the 9.0 cm. Keeping the significant figures in view, the density of the material of the cube can be best expressed as X × 10³ kg m⁻³ where the value of X is:

In a vernier calliper, 20 VSD coincide with 16 MSD (each division of length 1 mm). The least count of the vernier callipers is:

A balloon is made of a material of surface tension S and its inflation outlet (from where gas is filled in it) has small area A. It is filled with a gas of density ρ and takes a spherical shape of radius R. When the gas is allowed to flow freely out of it, its radius r changes from R to 0 (zero) in time T. If the speed v(r) of gas coming out of the balloon depends on r as r^α and T ∝ S^α β^ρ γ^R^δ then

Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its 10 Vernier Scale Divisions (V.S.D.) are equal to its 9 Main Scale Divisions (M.S.D.). The least division in the M.S. is 0.1 cm and the zero of V.S. is at x = 0.1 cm when the jaws of Vernier callipers are closed. If the main scale reading for the diameter is M = 5 cm and the number of coinciding vernier division is 8, the measured diameter after zero error correction, is

A physical quantity P is related to four observations a, b, c and d as follows: P = a³b²/c√d The percentage errors of measurement in a, b, c and d are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity P is

In a vernier calipers, \( (N + 1) \) divisions of vernier scale coincide with \( N \) divisions of main scale. If 1 MSD represents 0.1 mm, the vernier constant (in cm) is :

The quantities which have the same dimensions as those of solid angle are:

A force defined by F = αt² + βt acts on a particle at a given time t. The factor which is dimensionless, if α and β are constants, is:

The errors in the measurement which arise due to unpredictable fluctuations in temperature and voltage supply are:

A metal wire has mass (0.4 ± 0.002) g, radius (0.3 ± 0.001) mm and length (5 ± 0.02) cm. The maximum possible percentage error in the measurement of density will nearly be:

Plane angle and solid angle have:

The dimensions [MLT⁻²A⁻²] belong to the:

Match List – I with List – II:

The area of a rectangular field (in m²) of length 55.3 m and breadth 25 m after rounding off the value for correct significant digits is:

If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.

A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is :

If E and G respectively denote energy and gravitational constant, then \( \frac{E}{G} \) has the dimensions of :

Dimensions of stress are:

A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:

Taking into account of the significant figures, what is the value of 9.99 m − 0.0099 m?

In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where X = A²B¹/²C³D², will be:

A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of^{-0}.004 cm, the correct diameter of the ball is

A physical quantity of the dimensions of length that can be formed out of c, G and e²/4πε₀ is

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is

If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be

If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are

The pair of quantities having same dimensions is:

Vectors A, B and C are such that A + B = 0 and A ⋅ C = 0. Then the vector parallel to A is: