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qUESTIONS

Vector Ā makes equal angles with x, y and z axis. Value of its components (in terms of magnitude of Ā) will be

If A = 3ì +4j and B = 7ì + 24j, the vector having the same magnitude as B and parallel to A is

A force of 5 N acts on a particle along a direction making an angle of 60° with vertical. Its vertical component be

If a particle moves from point P (2,3,5) to point Q (3,4,5). Its displacement vector be

The dimensions of B^2/2μο where B is magnetic field and µo is the magnetic permeability of vacuum, is. [2020]

In a simple pendulum experiment for determination of acceleration due to gravity (g), time taken for 20 oscillations is measured by using a watch of 1 second least count. The mean value of time taken comes out to be 30s. The length of pendulum is measured by using a meter scale of least count 1 mm and the value obtained is 55.0cm. The percentage error in the determination of g is close to [2019]

The least count of the main scale of a screw gauge is 1 mm. The minimum number of divisions on its circular scale required to measure 5µm diameter of wire is [2019]

The force of interaction between two atoms is given by F =αβexp (-x^2/αkt); where x is the distance, k is the Boltzmann constant and T is temperature and α and β are two constants. The dimension of β is :

The diameter and height of a cylinder are measured by a meter scale to be 12.6 ± 0.1 cm and 34.2 ± 0.1 cm, respectively. What will be the value of its volume in appropriate significant figures [2019]

The density of a material in Sl units is 128 kg m³. In certain -3 units in which the unit of length is 25cm and the unit of mass is 50g, the numerical value of density of the material is [2019]

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