EdgineerX

1101. Simple harmonic motion may be regarded as the projection on a diameter of

A. uniform circular motion B. a parabolic path C. a damped decay D. a straight line motion E. random motion

1102. The maximum acceleration of a body in SHM of amplitude x0 and angular frequency omega is

A. omega x0 B. omega squared x0 C. omega squared divided by x0 D. omega x0 squared E. x0 divided by omega

1103. The time period of a simple pendulum is independent of

A. its length B. the square root of the length C. the value of g D. the mass of the bob E. the location on Earth

1104. When a transverse pulse on a string is reflected from a rigid support, it undergoes a phase change of

A. 270 degrees B. 90 degrees C. 0 degrees D. 360 degrees E. 180 degrees

1105. If the distance from a point source of sound is doubled, the intensity becomes

A. unchanged B. half C. one quarter D. double E. four times

1106. SONAR is used to determine the depth of the sea using

A. ultrasonic waves and their echo time B. infrasonic waves only C. visible light D. gamma rays E. radio waves

1107. The principle of superposition states that where two waves meet, the resultant displacement is

A. the product of the individual displacements B. the algebraic sum of the individual displacements C. always zero D. the larger of the two displacements E. the difference of the amplitudes only

1108. If the tension in a stretched string is made four times, the fundamental frequency becomes

A. half B. one quarter C. double D. four times E. unchanged

1109. Diffraction effects are most noticeable when the size of the obstacle or aperture is

A. equal to the amplitude B. much smaller than the wavelength in every dimension C. much larger than the wavelength D. independent of the wavelength E. comparable to the wavelength

1110. In a diffraction grating with more lines per centimetre, the diffracted orders become

A. independent of wavelength B. more widely separated C. less intense only D. identical to interference fringes E. closer together

1111. A magnifying glass produces an image that is

A. always at the focus B. real and inverted C. virtual, erect and magnified D. real and diminished E. virtual and diminished

1112. A telescope is said to be in normal adjustment when the final image is formed

A. at infinity B. at the objective C. at the focal point of the objective D. at the near point E. on the retina directly

1113. A spectrometer is used to

A. measure current B. magnify small objects C. measure resistance D. detect magnetic fields E. disperse light and measure wavelengths

1114. The entropy of a substance during melting at its melting point

A. becomes zero B. remains constant C. decreases D. increases E. becomes negative

1115. A diesel engine is generally more efficient than a petrol engine because it operates with a

A. lower peak temperature B. higher compression ratio C. spark plug D. richer fuel mixture E. lower compression ratio

1116. An ideal gas is compressed adiabatically. Its temperature

A. becomes zero B. stays constant C. falls D. first rises then falls E. rises

1117. Heat supplied to a gas at constant pressure is used to

A. increase the internal energy and do external work B. increase the pressure only C. do external work only D. increase the internal energy only E. lower the temperature

1118. The electric flux through a surface of area A held at angle theta to a uniform field E is

A. E/A cos theta B. EA sin theta C. EA tan theta D. EA E. EA cos theta

1119. Charge on an irregularly shaped conductor accumulates most densely

A. inside the conductor B. at flat regions C. at sharply curved regions and points D. at the centre of mass E. uniformly everywhere

1120. The potential energy of two point charges q1 and q2 separated by r is

A. k q1 divided by q2 r B. k q1 q2 divided by r C. k q1 q2 times r D. k q1 q2 divided by r squared E. zero

1121. In a cathode ray tube, electrons are produced by

A. field ionization of the gas B. photoelectric emission from the anode C. secondary emission at the screen D. radioactive decay E. thermionic emission from a heated filament

1122. A 100 W bulb operated for 10 hours consumes

A. 10 kWh B. 1 kWh C. 100 kWh D. 0.1 kWh E. 1000 kWh

1123. The resistance of a metallic conductor at temperature t is related to its resistance at 0 degrees Celsius by

A. R = R0 alpha t B. R = R0 divided by alpha t C. R = R0 (1 + alpha t) D. R = R0 (1 - alpha t) E. R = alpha t

1124. A cell of emf 2 V and internal resistance 0.5 ohm delivers current to a 1.5 ohm external resistor. The current is

A. 1 A B. 1.33 A C. 4 A D. 0.5 A E. 2 A

1125. Kirchhoff's second rule is based on the conservation of

A. momentum B. charge C. flux D. mass E. energy

Physics