SINDH MDCAT 2015 PAPER

1. mλ = 2d sinθ, this relation is called as _____.

2. A microscope has an objective of 10 mm focal length and eye piece of 25 mm focal length. What is the distance between the lenses, if the object is in sharp focus when it is 10.5 mm from the objective?

3. A gas is enclosed in a container fitted with a piston of cross sectional area 0.10 m^2. The pressure of the gas is maintained at 8000 N/m2. When heat is slowly transferred, the piston is pushed up through a distance of 4.0 cm. If 42 J heat is transferred to the system during the expansion, what is the change in internal energy of the system?

4. A particle carrying charge of 2e falls through a potential difference of 3 V. Calculate the energy acquired by it.

5. The total outward flux over any closed hypothetical surface is called _____ is equal to the total charge enclosed divided by co irrespective of the way in which the charge is distributed.

6. Two capacitors C1 (6uF) and C2 (12uF) are in series across a 180 volts D.C supply. Calculate the potential difference across each capacitor (C1 and C2).

7. 0.75 A current flows through an iron wire when a battery of 1.5 volt is connected across its ends. The length of the wire is 5 m and its cross sectional area is 2.5 x 10 m^2. What is the resistivity of Iron?

8. The potential difference between the terminals of a battery in an open circuit is 2.2 V When it is connected across a resistance of 5.0 ohm, the potential falls to 1.8V. What is the internal resistance of the battery? (Approx)

9. A 20 cm wire carrying a current of 10 A is placed in a uniform magnetic field of 0.30 T. If the wire makes an angle of 40 with the direction of magnetic field, find the (approx) magnitude of the force acting on the wire? (Sin 40 = 0.642)

10. A circuit in which there is a current of 10 amperes is changed so that the current falls to zero in 0.5 seconds. If an average e.m.f of 400 volts is induced, what is the self inductance of the circuit?