National Standard Examination in Physics (NSEP) Solved Paper 2016 Part-10

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Q: 35. A solid wooden block with a uniform cross section is floating in water (density ) with a height below water. Now a flat slab of stone is placed over the wooden block but the block still floats with a height below water. Afterward the stone is removed from the top and pasted at the bottom of the wooden block. The wooden block now floats with a height under water. Therefore, the density of the stone is

(A)

(B)

(C)

(D)

Answer: (C)

Q: 36. Two wires made of the same material, one thick and the other thin, are connected to form a composite wire. The composite wire is subjected to some tension. A wave travelling along the wire crosses the juction point. The characteristic that undergoes a change at the junction point is

(A) Frequency only

(B) Speed of propagation only

(C) Wavelength only

(D) The speed of propagation as well as the wavelength

Answer: (D)

Q: 37. Ultraviolet light of wavelength 300 nm and intensity 1 falls on the surface of a photosensitive material. If one percent of the incident photons produce photoelectrons then the number of photoelectrons emitted per second from an area of 1 of the surface is nearly

(A)

(B)

(C)

(D)

Answer: (A)

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