Himachal Pradesh HPTET N-2513 - Free Online Practice Test

111. Electromagnets are made of soft iron because soft iron has A. high retentivity & high coercivity B. low retentivity & low coercivity C. high retentivity & low coercivity D. low retentivity & high coercivity

112. The core of a transformer is laminated to A. prevent rusting B. minimize eddy current loss C. increase voltage ratio D. reduce weight

113. Speed of electromagnetic waves in vacuum is A. ε₀ μ₀ B. √(ε₀ μ₀) C. 1/√(ε₀ μ₀) D. 1/ε₀ μ₀

114. Speed of light in water (n=1.33) A. 3×10⁸ B. 2.26×10⁸ C. 4×10⁸ D. 1.33×10⁸

115. In refraction, light bends because A. frequency changes B. elasticity changes C. speed of light changes D. amplitude decreases

116. Sir C.V. Raman got Nobel Prize for which phenomenon? A. Scattering B. Diffraction C. Interference D. Polarization

117. A photon has energy E, velocity c and frequency ν, which represents its wavelength? A. hc/E B. hν/c C. hν/c² D. hν

118. If half-life of a radioactive substance is 225.8 min, decay constant is A. 3.1×10⁻³ min⁻¹ B. 3.1×10⁻⁴ min⁻¹ C. 3.1×10⁻⁶ min⁻¹ D. 3.1×10⁻⁹ min⁻¹

119. Which is used as moderator in nuclear reactor? A. Cadmium B. Plutonium C. Uranium D. Heavy water

120. Which impurity produces N-type semiconductor when added to silicon? A. Phosphorus B. Aluminium C. Magnesium D. Both (B) & (C)