A copper block of mass 0.4 kg is heated from 25 C to 45 C. If the specific heat of copper is 0.39 kJ/kg-K, the heat required is:
A3.12 kJ
B1.56 kJ
C0.78 kJ
D2.34 kJ
CUETPhysics
An electron and a proton have the same kinetic energy. Which of the following is true about their de Broglie wavelengths?
Aλ_e = λ_p
Bλ_e > λ_p
Cλ_e < λ_p
Dλ_e = 2λ_p
AEEEPhysics
In a nuclear fusion reaction, two deuterium nuclei combine to form a helium-4 nucleus. The energy released is due to:
AConversion of mass into energy
BConversion of energy into mass
CIncrease in binding energy per nucleon
DDecrease in total binding energy
EAPCETPhysics
Three identical incandescent bulbs, each of resistance R, are first connected in series and then in parallel to an ideal battery of emf ε. The ratio of the total power dissipated in the series combination to that in the parallel combination is:
A1 : 9
B1 : 3
C3 : 1
D1 : 1
EAPCETPhysics
An AC voltage V = V_0*sin(omega*t) is applied across a series LCR circuit at resonance. The voltage across the inductor is
AGreater than V_0
BV_0
CZero
DLess than V_0
VITEEEPhysics
Two point charges +q and -q are placed at distances -a and +a from the origin on the x-axis. The electric field at a point on the y-axis at distance y from the origin (where y >> a) is proportional to:
A1/y
B1/y²
C1/y³
D1/y⁴
CUETPhysics
The ratio of the speed of sound in hydrogen (γ = 1.4) to that in oxygen (γ = 1.4) at the same temperature is (molar mass of H₂ = 2, O₂ = 32):
A4 : 1
B1 : 4
C1 : 2
D2 : 1
JEE MainPhysics
In an adiabatic process, if volume doubles for a diatomic gas (gamma = 1.4), the pressure ratio is:
A2⁻¹·⁴
B1.4²
C2⁰·⁴
D2¹·⁴
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