Assertion: Air quickly leaking out of a balloon becomes cooler
Reason: The leaking air undergoes adiabatic expansion
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
A.
If both assertion and reason are true and reason is the correct explanation of assertion
Air quickly leaking out of ballon undergoes adiabatic expansion causes cooling effect.
Assertion: In pressure-temperature (P-T) phase diagram of water, the slope of the melting curve is found to be negative.
Reason: Ice contracts on melting to water
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: For higher temperatures the peak emission wavelength of a black body shifts to lower wavelengths.
Reason: Peak emission wavelengths of a blackbody is proportional to the fourth power of temperature.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: For Reynold number Re > 2000, the flow of fluid is turbulent.
Reason: Inertial forces are dominant compared to the
viscous forces at such high Reynold numbers.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
A conducting ring of radius 1 meter is placed in a uniform magnetic field B of 0.01 tesla oscillating with frequency 100 Hz with its plane at right angle to B. What will be the induced electric field?
volts/m
2 volts/m
10 volts/m
62 volts/m
Two infinitely long parallel conducting plates having surface charge densities + σ and σ respectively, are separated by a small distance. The medium between the plates is vacuum. lf ε0 is the dielectric permittivity of vacuum, then the electric field in the region between the plates is
0 volt/metre
volt/metre
volt/metre
volt/metre
A 50 Hz a.c source of 20 volts is connected across R and C as shown in figure. The volage across R is 12 volt. The voltage across C is
8 V
16 V
10 V
not possible to determine unless values of R and C are given
In case of linearly polarised light, the magnitude of the electric field vector
does not change with time
varies periodically with time
increases and decreases linearly with time
is parallel to the direction of propagation
For ensuring dissipation of same energy in all three resistors (R1 , R2 , R3 ) connected as shown in figure, there values must be related as
R1 = R2 = R3
R2 = R3 and R1 = 4 R2
R2 = R3 and R1 = (R2/4)
R1 = R2 + R3