Engineering Questions — Physics

Q.26. The dimensional formula of ( = permittivity of vacuum and E = electric field) is . The value of =

Q.34. The two wires A and B of equal cross-section but of different materials are joined together. The ratio of Young's modulus of wire A and wire B is 20/11. When the joined wire is kept under certai

Q.29. If x and y coordinates of a projectile as a function of time (t) are given as and , respectively, then the angle (in degrees) made by the projectile with horizontal when is

Q.40. A 30 cm long solenoid has 10 turns per cm and area of 5 cm². The current through the solenoid coil varies from 2 A to 4 A is 3.14 s. The e.m.f. induced in the coil is a × 10⁻⁵ V. The value a is

Q.44. The de Broglie wavelength associated with an electron accelerated through a potential difference V is and the de Broglie wavelength associated with a proton accelerated through the same potenti

Q.30. A thin biconvex lens is prepared from the glass (μ = 1.5) both curved surfaces of which have equal radii of 20 cm each. Left side surface of the lens is silvered from outside to make it reflecti

Q.32. A body of mass m is taken from the surface of earth to a height equal to twice the radius of earth (R). The increase in potential energy will be ________. (g is acceleration due to gravity at th

Q.39. Given below are two statements: one is labelled as Assertion (A): and the other is labelled as Reason (R). Assertion (A): The electromagnetic wave exerts pressure on the surface on which they ar

Q.43. An inductor of inductance 10 mH having resistance of 100 \Omega is connected to battery of E.M.F. 1.0 V through a switch as shown in the figure below. After switch is closed, the ratio of instan

Q.31. Two identical bodies, projected with the same speed at two different angles cover the same horizontal range R. If the time of flight of these bodies are 5 s and 10 s, respectively, then the valu