In which of the following heat loss is primarily not due to convection?
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(a) boiling of water (b) land and sea breeze (c) heating of glass surface of a bulb due to current […]
A spherical body of emissivity e=0.6, placed inside a perfectly black body is maintained at temperature T then the energy radiated per second will be
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(a) E=0.4 eAT⁴ (b) E=0.8 eAT⁴ (c) E=0.6 […]
A cylindrical tank is filled with water to a level of 3m. A hole is opened at a height of 52.5 cm from bottom. The ratio of the area of the hole to that at […]
A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100 ohm through a current of 1 A for 5 min, then change in internal energy is
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If in an experiment for determination of velocity of sound by resonance tube method using a tuning fork of 512 Hz, first resonance was observed at 30.7 cm and second was obtained at 63.2 cm. […]
A moving coil galvanometer of resistance 100 Ω is converted to ammeter by a resistance of 0.1 Ω in the circuit. Galvanometer gives full scale deflection at 100 μA. The minimum current in the circuit […]
The point of suspension λ of a simple pendulum with normal time period T₁ is moving upward according to equation y=kt² where k=1 m/s². If new time period is T² the ratio T₁²/T₂² will be […]
A capacitor of 2.5 μF is charged through a resistor of 4 MΩ. In how much time will potential drop across capacitor will become 3 times that of resistor (ln2=0.693)
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(a) 13.86 […]
If the pressure of gas is increased from 1.01×10⁵ Pa to 1.165×10⁵ Pa and volume is decreases by 10% at constant temperature then the bulk modulus of the gas is
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(a) 15.5×10⁵ […]
A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state after few microseconds another photon of energy 15 eV collides inelastically with same hydrogen atom. Finally by a suitable detector we […]
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