List of top Questions asked in BCECE

Maximum kinetic energy of a photoelectron varies with the frequency (f) of the incident radiation as
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 rms speed of oxygen at room temperature is about 500 m/s. The rms speed of hydrogen at the same temperature is about
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
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
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)
If pressure and temperature of an ideal gas are doubled and volume is halved, the number of molecules of gas
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 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
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.
How do you distinguish chlorobenzene A C from benzyl chloride ?