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Newton–second is the unit of
A conducting circular loop of face area $2.5 \times 10^{-3} \text{ m}^2$ is placed perpendicular to a magnetic field which varies as $B=0.5 \sin(100\pi t) \text{ T}$. The magnitude of induced EMF at time $t=0 \text{ s}$ is:
Snow-blindness in Antarctic region is due to
In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:
In the Young's double-slit experiment, the intensity of light at a point on the screen (where the path difference is $\lambda$) is $K$, where $\lambda$ is the wavelength of light used. The intensity at a point where the path difference is $\lambda/4$ will be
The correct order of first ionization enthalpy for the given four elements is:
For a transparent medium, relative permeability and permittivity, $\mu_r$ and $\varepsilon_r$ are 1.0 and 1.44 respectively. The velocity of light in this medium would be:
What is the change in oxidation number of carbon in the following reaction? $\text{CH}_4(g) + 4\text{Cl}_2(g) \rightarrow \text{CCl}_4(l) + 4\text{HCl}(g)$
A rod of length $L$ rotates with a small uniform angular velocity $\omega$ about its perpendicular bisector. A uniform magnetic field $B$ exists parallel to the axis of rotation. The potential difference between the centre of the rod and an end is:
An unpolarised light beam strikes a glass surface at Brewster's angle. Then:
A tuning fork with a frequency of $800 \text{ Hz}$ produces resonance in a resonance column tube with the upper end open and the lower end closed by the water surface. Successive resonances are observed at lengths of $9.75 \text{ cm}$, $31.25 \text{ cm}$, and $52.75 \text{ cm}$. The speed of the sound in the air is:
Twenty seven drops of same size are charged at $200 \text{ V}$ each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
Which one of the followings has maximum number of atoms ?
The number of protons, neutrons and electrons in $^{175}_{71}\text{Lu}$, respectively, are
Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having a surface area of 20 cm². The energy received by the surface during a time span of 1 minute is:
The equation of state of some gases can be expressed as (P + a/V²)(V − b) = RT. Here P is the pressure, V is the volume, T is the absolute temperature and a, b, R are constants. The dimensions of ‘a’ are:
A linearly polarized monochromatic light of intensity 10 lumen is incident on a polarizer. The angle between the direction of polarization of the light and that of the polarizer such that the intensity of output light is 2.5 lumen is:
A student measured the diameter of a small steel ball using a screw gauge of least count $0.001\text{ cm}$. The main scale reading is $5\text{ mm}$ and zero of circular scale division coincides with $25$ divisions above the reference level. If the screw gauge has a zero error of $-0.004\text{ cm}$, the correct diameter of the ball is:
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
Two bodies with kinetic energies in the ratio of $4 : 1$ are moving with equal linear momentum. The ratio of their masses is: