List of top Questions asked in BCECE

Maximum kinetic energy of a photoelectron varies with the frequency (f) of the incident radiation as
The critical angle for glass is 41°48' and that for water is 48°36'. Calculate the critical angle for glass-water interface.
The magnetic flux through a coil varies with time as Q=5t2+6t+9. The ratio of emf at t=3s to t=0s will be
A wire loop PQRSP formed by joining two semicircular wires of radii R1, and R2 carries a current I as shown in figure below. The magnitude of magnetic induction at centre C is
two semicircular wires-carries a current
An alternating voltage V=V0, sin ωt is connected to a capacitor of capacity Co through an A.C. ammeter of zero resistance. The reading of ammeter is
A letter 'A' is constructed of a uniform wire with resistance 1.0 Ω cm-1. The. 110 sides of the letter are 20 cm and the cross-piece in the middle is 10 cm long. The apex angle is 60°. The resistance between the ends of the legs is
A charged particle moves with a velocity V in a circular path of radius R around a long uniformly charged conductor then
The capacitance of a parallel plate capacitor becomes \(\frac{4}{3}\) times its original value if a dielectric slab of thickness t=\(\frac{d}{2}\) is inserted between the plates (where d is the distance of separation between the plates). What is the dielectric constant of the slab?
A particle moves according to the law x=r cos \(\frac{π}{2}\) The distance covered by it in the time interval between t=0 and t=3s is.
The distance between two points differing in phase by 60° on a wave having a wave velocity 360 m/s and frequency 500 Hz is
The rms speed of oxygen at room temperature is about 500 m/s. The rms speed of hydrogen at the same temperature is about
Two liquids A and B are at 32°C and 24°C. When mixed in equal masses the temperature of mixture is found to be 28°C. Their specific heats are in the ratio
If pressure and temperature of an ideal gas are doubled and volume is halved, the number of molecules of gas
In each heart beat, a heart pumps 80 ml of blood at an average pressure of 100 mm of Hg. Assuming 60 heart beats per second, the power output of the heart is (PHg=13.6x103 kgm-3) (g = 9.8 ms-2)
The length of a metal wire is l1, when the tension in it is T1, and is l2 when the tension is T2. The natural length of wire 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
A curved road of diameter 1.8 km3 is banked so that no friction is required at a speed of 30 m/s. What is the banking angle ?
A tunnel is dug along the diameter of the earth. A mass m is dropped into it. How much time does it take to cross the earth?
A body of density p and volume V is lifted through height h in a liquid of density \(σ (< p)\). The increase in potential energy of the body is
The co-efficient of friction between two surfaces is μ=0.8. The tension in the string as shown in the figure is
The tension in the string
A body moves along a straight line with acceleration 3 ms-2 for 2 seconds and then with acceleration 4 ms-2 for 3 seconds. What is his average acceleration ?
Two bodies are projected at angles e and (90°-θ) to the horizontal with the same speed. The ratio of their times of flight is
The dimensional formula for permittivity of free space (80) in the equation F=\(\frac{1}{4\pi{e_0}}\)\(\frac{q_1q_2}{r^2}\) where, symbols have their usual meaning is
Which of the following do not contain carbon-oxygen double bonds?
Identify the correct statement.