Question 4881:

A cell with an emf of \(1.5 V\) and an internal resistance of \(10 .\). fohims 1 connegted to two resistances of \(2.0\) and \(3.0\) ohms in series. The current produced by this cell is

A. \(0.25 A\)
B. \(2.5 A\)
C. \(0.5 A\)
D. \(0.75 A\)

Question 4882:

Which of the following is not essential for the productipn of elèctron by thermionic emission?

A. Tungsten target
B. Reflection plate
c) Futrescent
C. Hot cathode

Question 4883:

If an object moves with a constant speed round a circlf, it has an acceleration which is

A. Constant in magnitude and varying \(z\) cheation
B. Varying in magnitude and constant in pirection
C. Constant in magnitude andidireevion
D. Varying in magnitude and direction

Question 4884:

An electric string of length \(X\) is stretched through a length by force F. The area of cross-section of the string is \(A\) and its young modulus is \(E\).
Which of the following expression is correct?

A. \(F =\frac{E A c}{x}\)
B. \(F =\frac{E A e}{X^{2}}\)
C. \(F =\frac{E A \varepsilon^{2}}{x}\)
D. \(F =\frac{E A e^{2}}{X^{2}}\)

Question 4885:

The density of a solid is \(130 gcm 3\) at the temperature of \(25^{\circ} C\). Find the density at \(150^{\circ} C\) the linear expansion of the solid is \(2.0 \times 105 K 1\).

A. \(21.90 gcm 3\)
B. \(9.021 .90 gcm 3\)
C. \(12.9 gcm 3\)
D. \(20.521 .90 gcm 3\)