Engineering Questions — Physics

Q.41. A spherical interface lens of radius R separates two media of refractive indices 1 and 1.4 respectively as shown in the figure below. A point source is placed at a distance of 4R in front of sph

Q.41. An object AB is placed 15 cm on the left of a convex lens P of focal length 10 cm. Another convex lens Q is now placed 15 cm right of lens P. If the focal length of lens Q is 15 cm, the final im

Q.47. A gun mounted on the ground fires bullets in all directions with same speed. The farthest distance the bullets could reach is 6.4 m. The speed of the bullets from the gun is __________ m/s. (tak

Q.45. In a semiconductor p-n diode, the doping concentrations on p-side and n-side are atoms/cm³ and atoms/cm³, respectively. Which one of the following statement is true?

Q.31. A metal string A is suspended from a rigid support and its free end is attached to a block of mass M. Second block having mass 2M is suspended at the bottom of the first block using a string B.

Q.48. A series LCR circuit with , H and is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is .

Q.30. A wheel initially at rest is subjected to a uniform angular acceleration about its axis. In the first 2 s it rotates through an angle . In the next 2 s it rotates through an angle . The ratio i

Q.42. Light ray incident along a vector AO(AO=2\hat{i}-3\hat{j}) emerges out along vector OB(OB=C\hat{i}-4\hat{j}) as shown in the figure below. The value of C is

Q.38. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : In electrostatics, a conductor does not store any net charge inside. Reason R

Q.39. A river of width 200 m is flowing from west to east with a speed of 18 km/h. A boat, moving with speed of 36 km/h in still water, is made to travel one-round trip (bank to bank of the river). Mi