When radiation of wavelength λ is used to illuminate a metallic surface, the stopping potential is V.
When radiation of wavelength λ is used to illuminate a metallic surface, the stopping potential is V. When the same... View Article
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An engine takes in 5 moles of air at 20°C and 1atm, and compresses it adiabaticaly to 1/10th of the original volume.
An engine takes in 5 moles of air at 20°C and 1atm, and compresses it adiabaticaly to 1/10th of the... View Article
A small block starts slipping down from a point B on an inclined plane AB
A small block starts slipping down from a point B on an inclined plane AB, which is making an angle... View Article
A particle of mass m with an initial velocity
A particle of mass m with an initial velocity \(\begin{array}{l}u\hat{i}\end{array} \) collides perfectly elastically with a mass 3m at rest.... View Article
The least count of the main scale of a vernier callipers is 1 mm
The least count of the main scale of a vernier callipers is 1 mm. Its vernier scale is divided into... View Article
Shown in the figure is rigid and uniform one meter long rod AB held in horizontal position by two strings tied to its ends and attached to the ceiling.
Shown in the figure is rigid and uniform one meter long rod AB held in horizontal position by two strings... View Article
Train A and train B are running on parallel tracks in the opposite directions with speeds of 36 km/hour and 72 km/hour, respectively.
Train A and train B are running on parallel tracks in the opposite directions with speeds of 36 km/hour and... View Article
A charged particle (mass m and charge q) moves along X axis with velocity V0.
A charged particle (mass m and charge q) moves along X axis with velocity V0. When it passes through the... View Article
In a reactor, 2 kg of 92U235 fuel is fully used up in 30 days. The energy released perfission is 200 MeV. Given that the Avogadro number, N = 6.023 × 1026per kilo mole and1 eV =1.6 × 10–19 J. The power output of the reactor is close to
a) 60 MW b) 54 MW c) 125 MW d) 35 MW \(\begin{array}{l}n(moles)=\frac{2kg}{235gm}=\frac{2000}{235}\end{array} \) No. of nucleus = NA x... View Article
A uniform cylinder of mass M and radius R is to be pulled over a step of height
A uniform cylinder of mass M and radius R is to be pulled over a step of height a(a <... View Article
Two identical strings X and Z made of same material have tension Tx and Tz in them. If their fundamental frequencies are 450 Hz and 300 Hz, respectively, then the ratio Tx/Tz is:
a) 2.25 b) 1.25 c) 0.44 d) 1.5 \(\begin{array}{l}f=\frac{1}{2L}\sqrt{\frac{T}{\mu }}\end{array} \) given, μx = μz & Lx = Ly as... View Article
A beam of protons with speed 4 x 105 ms–1 enters a uniform magnetic field of 0.3 T at an angle of 60° to the magnetic field. The pitch of the resulting helical path of protons is close to: (Mass of the pr oton =1.67 × 10–27 kg, charge of the proton =1.69 × 10–19C)
a) 4 cm b) 2 cm c) 12 cm d) 5 cm Pitch = Vcos 600 x T = \(\begin{array}{l}\frac{V2\pi... View Article
Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity ρc, ρm , ρT and ρA respectively. Then:
a) ρc > ρA> ρT b) ρA> ρm > ρc c) ρA> ρT > ρc d) ρm > ρA> ρc... View Article
A plane electromagnetic wave, has frequency of 2.0 × 1010 Hz and its energy density is 1.02 × 10–8 J/m3 in vacuum.
A plane electromagnetic wave, has frequency of 2.0 × 1010 Hz and its energy density is 1.02 × 10–8 J/m3... View Article
A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T.
A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. Assuming the gases... View Article
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ... View Article
Magnetic materials used for making permanent magnets (P) and magnets in a transformer (T)
Magnetic materials used for making permanent magnets (P) and magnets in a transformer (T) have different properties of the following,... View Article
A bead of mass m stays at point P (a, b) on a wire bent in the shape of a parabola
A bead of mass m stays at point P (a, b) on a wire bent in the shape of a... View Article
If speed V, area A and force F are chosen as fundamental units
If speed V, area A and force F are chosen as fundamental units, then the dimension of; Young’s modulus will... View Article
A cylindrical vessel containing a liquid is rotated about its axis so that the liquid rises at its sides as shown in the figure.
A cylindrical vessel containing a liquid is rotated about its axis so that the liquid rises at its sides as... View Article
