91. The relation between velocity, frequency, and wavelength of a wave is?
(A) vf=λ
B) fλ=v
(C) vλ=f
(D) v=λ/f
92. _ method is used to transfer the energy.
A) Radiation
(B) Conduction
(C) Wave Motion
(D) All of the above
93. One of the isotopes of uranium is 238U92, the number of neutrons in this isotope is?
(A) 92
B) 146
(C) 238
(D) 330
94. If X=A.B, then X is ‘1’ when?
A) A=1, B=1
(B) A=0, B=0
(C) A=0, B=1
(D) A=1, B=0
95. The presence of a magnetic field can be detected by?
(A) Small mass
(B) Stationary positive charge
(C) Stationary negative charge
D) Magnetic compass
96. The coating of a thin layer of zinc on steel or iron objects is known as:
A. Galvanising
B. Hot dipping
C. Tinning
D. Electroplating
97. Electric current in a metal wire is due to the flow of:
A. Portons
B. Electrons
C. Ions
D. None of these
98. Optic fibers are mainly used for:
A. Weaving
B. Communication
C. Musical instrument
D. Food industry
99. Which among the following is a chemical change?
A. A wet towel dries in the sun
B. Lemon juice added to tea causing it to change
C. Coffee is brewed by passing steam through ground coffee
D. Hot air rises over a radiator
100. Which of the following is a vector quantity?
A. Force
B. Temperature
C. Energy
D. Momentum
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