List of top Physics Questions asked in BCECE

The velocity of light in a medium is √3\(\times\)10⁸m/s. The polarizing angle of incidence is:

A 100-W bulb and 4 25-W bulbs are made for the same voltage. They have filaments of the same length and material. The ratio of the diameter of the 100-W bulb to that of the 25-W bulb is:

A baby cools from 50°C to 40°C in 5 min. The surrounding temperature is 20°C. In what further time (in minutes) will it cool to 30°C?

A,B and C are voltmeters of resistance R, \(\frac{3}{2}R\) and 3R respectively. When some potential difference is applied between X and Y, the voltmeters readings are V_A, V_B and V_C respectively. Then:

Work done in turning a magnet of magnetic moment M by an angle of 90? from the mgnetic meridian is n times the corresponding work done to turn through an angle of 60?, where n is

The moment of inertia of a sphere of mass M and radius R about an axis passing through its centre is \(\frac{2}{5}\) MR² The radius of gyration of the sphere about a parallel axis to the above and tangent to the sphere is

The minimum number of geostationary satellites required for uninterrupted global coverage is

If θ is the polarising angle for two optical media whose critical angles are C₁ and C₂ then the correct relation is

An electron and a proton enter a magnetic field perpendicularly both have same kinetic energy. Which of the following is true?

The reason a moving coil galvanometer cannot be used with an alternating current is that

Select the output Y of the combination of gates shown in figure for inputs A = 1, B = 0; A = 1, B = 1 and A = 0, B = 0 respectively.

If the vertical component of earth's magnetic field at a place is √3 times the horizontal component, then the value of dip at that place is

The temperature co-efficient of resistance of a wire is 0.00125/°C. Its resistance is 1Ω at 300 K. At what temperature, its resistance will be 2Ω?

If the mass shown in figure is slightly displaced and then let go, then the system shall oscillate with a time period of

In Young's double slit experiment, using a monochromatic light of wavelength λ, the intensity of light at a point on the screen where path difference is \(\lambda\) is K units. Then the intensity of light at a point where path difference is \(\frac{\lambda}{3}\) is

Two thin lenses have a combined power of +9D. When they are separated by a PY distance of 20 cm, their equivalent power becomes \(+\frac{27}{5}D\), then their individual powers are

A 1 cm height needle is placed at a distance of 0.1 m from a convex mirror of focal length 0.05 m, then size of the image is

A transformer of efficiency 90% has turns ratio 1: 10. If the voltage across the primary is 220 V and current in the primary is 0.5 A, then the current in secondary is

Two long parallel wires placed 0.08 m apart carry currents 3 A and 5 A in the same direction. What is the distance from the conductor carrying larger current to the point where the resultant magnetic field is zero ?

A copper wire of 3 mm² cross sectional area carries a current of 5 ampere. The magnitude of the drift velocity for the electrons in the wire, (Assume copper to be monovalent, M_cu 63.5 kg/k mol and density of copper = 8920 kg/m³)

The relative permeability is represented by μ_r and the susceptibility by X for a magnetic substance. Then for a paramagnetic substance

A stream of water flowing horizontally with a speed of 15 ms^-1 gushes out of a tube of cross-sectional area 10^-2m² and hits a vertical wall nearly. The force exerted on the wall by the impact of water assuming it does not rebound is

An electric field \(\vec{E}=(2\hat{i}+3\hat{j})N/C\) exists in space. The potential difference (V_P - V_Q) between two points P and Q whose position vectors \(\vec{r}_P=\hat{i}+2\hat{j}\) and \(\vec{r}_Q=2\hat{i}+\hat{j}+\hat{k}\) is

In the circuit below, the potential difference between A and B is

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm^-3 the angle remains the same. If density of the material of the sphere is 1.6 g cm^-3, the dielectric constant of the liquid is