PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move
- A. Upwards
- B. Downwards
- C. TOwards The North Pole
- D. Towards The South Pole
A capacitor of 10µF is connected across a cell of 12 volts as shown above, calculate the energy stored in the capacitor
- A. 7.2 x 10-4J
- B. 1.4 x 10-3J
- C. 1.4 x 10-3J
- D. 1.2 x 10-2J
The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct
- A. The reading of W is equal to that of Y and twice that of X
- B. The reading of Y is greater than that of Z
- C. The readings of W and Y are equal and each is greater than that of X
- D. The reading of Z is equal to the sum of the readings of Y and W
The diagram above shows a meter bridge in which two of thee arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end , calculate the value of R
- A. 1.2Ω
- B. 1.3Ω
- C. 3.0Ω
- D. 6.0Ω
The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be
- A. S-S poles
- B. S-N poles
- C. N-S poles
- D. N-N poles
The fig above shows the heights of two liquids X and Y when some air is sucked out of the apparatus through the pump P. The diameter of the table in X is twice That of the Tube In Y. What is the relative density of the liquid X with respect to liquid Y
- A. 1/3
- B. 2/3
- C. 3
- D. 6
In the diagram above, the hanging mass \(m_2\) is adjusted until \(m_1\) is on the verge of sliding. The coefficient of static friction between the mass \(m_1\) and the table is
- A. m1/m2
- B. m1g/m2
- C. m2/m1
- D. m2g/m1
A uniform light rod is kept in horizontal equilibrium under the influence of fore forces as shown above, which of the following equations correctly represents the condition of equilibrium for the rod
- A. F1 + F2 = F3 + F4
- B. F1 + F2 - F3 + F = 0
- C. (F1 + F2)ab = (F3 + F4)cd
- D. F1a + F2b - F3c - F4d = 0
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + X
- A. a proton
- B. a gamma ray
- C. a helium particle
- D. an alpha particle
After three half lifes, the fraction of a radioactive material that has decayed is
- A. \(\frac{1}{8}\)
- B. \(\frac{1}{3}\)
- C. \(\frac{2}{3}\)
- D. \(\frac{7}{8}\)
The threshold of frequency for photoelectric effect depends on the
- A. intensity of incident light
- B. frquency of incident light
- C. material of the photocathode
- D. potential difference between the cathode and the anode
In A.C circuit theory, the root means square (r.m.s) current, Irms and the peak (maximum)current Io are related by
- A. Io = \(\frac{I_rms}{\sqrt{2}}\)
- B. Irms = \(\frac{I_o}{\sqrt{2}}\)
- C. Irms = \(\frac{\frac{I}{I_o}}{\sqrt2}\)
- D. Irms = \(\frac{I_rms}{\sqrt{2}}\)
In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to
- A. volt, ampere and hertz
- B. ohms, volt and hertz
- C. watt, ohms and radian
- D. ohms, hertz and joule
The maximum permissible current through a galvanometer G of internal resistance 10\(\Omega\) is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G
- A. 20,000 ohms in parallel
- B. 19,990 ohms in series
- C. 1990 ohms in series
- D. 100 ohms in series
The heat produced in a conductor carrying an electric current is
- A. inversely proportional to the current and the resistance
- B. directly proportional to the current, resistance and the time
- C. inversely proportional to of the resistance, current and the time
- D. directly proportional to the square of the current, the resistance and the time
Which of the following apparatus will require the smallest fuse rating for its protection?
- A. 60W, 240V
- B. 60W, 40V
- C. 40W, 12V
- D. 40W, 5V
A 5-v battery is connected across the plates of a 2.0\(\mu\)F uncharged parallel plate capacitor. The charge on the capacitor after a long time is
- A. 2.5\(\mu\)C
- B. 10.0\(\mu\)C
- C. 20.0\(\mu\)C
- D. 50.0\(\mu\)C
A wire of length 15m made of a material of resistivity 1.8 x 10-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire
- A. 1.5 x 10-4m2
- B. 1.0 x 10-4m2
- C. 2.7 x 10-5m2
- D. 7.3 x 10-6m2
Which of the following factors has no effect on the e.m.f. of a primary cell?
- A. temperature
- B. size of the cell
- C. nature of the plate
- D. nature of the electrolyte
When an ebolite rod is rubbed with fur, it has
- A. no charge at all
- B. a negative charge
- C. a positive charge
- D. negative and positive charges
Calculate the force acting on an electron of charge 1.6 x 10-19C placed in an electric field of intensity 108Vm-1
- A. 1.6 x 10-11N
- B. 1.6 x 10-14N
- C. 1.6 x 10-16N
- D. 1.0 x 10-16N