DCE CEE Previous Year Paper 2002 - JEE MCQ

Critical angle for light going from medium (i) to (ii) isθ. The speed of light in medium (i) is v then speed in medium (ii) is :
 

The temperature of sink of Carnot engine is 27°C. Efficiency of engine is 25%. Then temperature of source is : ​

Which of the following graphs correctly represents the relation between ln E and ln T, where E is the amount of radiation emitted per unit time from unit area of body and T is the absolute temperature ?

If a body loses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest ?

If a gas has n degree of freedom, ratio of specific heats of gas is : ​

Two coils of self-inductance L1 and L2 are placed so closed together that effective flux in one coil is completely linked with other. If M is mutual inductance between them, M = ​

Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moments is : ​

In the figure shown, for an angle of incidence 45°, at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face ?​

If a current is passed through a spring then the spring will : ​

The power delivered by the source of circuit is maximum when : ​

A proton and anα-particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an α-particle is : ​

If two mirrors are kept at 60° to each other then the number of images formed by them is :​

An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force :​

 In insulators :

A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 m/s, the frequency of the reflected sound heard by the man sitting in the car will be nearest to :

The transverse nature of light is shown by :​

According to Bohr's theory, relation between n and radius of orbit is : ​

The colour sequence in a carbon resistor is red brown, orange and silver. The resistance of the resistor is : ​

A person cannot clearly see distances more than 40 cm. He is advised to use lens of power :​

In Young's double slit experiment distance between two sources is 0.1 mm. The distance of screen from the source is 20 cm. Wavelength of light used is 5460 Å. Then, angular position of the first dark fringe is :​

When 88Ra ²³⁶ decays in a series by emission of 3α-particle and 1β-particle, isotope X formed is : ​

The combination of the gates shown in figure below produces :​

If L and R denote inductance and resistance then dimensions of L/R is : ​

50 g of ice at 0°C is mixed with 50 g of water at 80°C, final temperature of mixture of will be : ​

A nucleus of 210Po84 originally at rest emitsα-particle with speed v. What will be the recoil speed of the daughter nucleus ?​

An inductor L and a capacitor C are connected in the circuit as shown in the figure. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero ampere ?​

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and separation between them is 2r. Intensity of magnetic field midway between them is : ​