SINDH MDCAT 2017 PAPER

1. A fixed mass of an ideal gas absorbs 1000 3 of heat and expands under a constant pressure of 20 kPa from a volume of 25 X 10^-3 m^3 to a volume of 50 X10^-3 m^3 .What is the change in internal energy of the gas?

2. In an experiment, an object was placed on the principal axis of a convex lens 25 centimeters away from the lens. A real image 4 times the size of the object was obtained. The local length of the lens is:

3. An object with constant mass rests on a horizontal surface whose coefficient of friction is 0.2. If a horizontal force F is applied to the object, what will be the effect(s) on the object?

I. It may move with constant speed in the direction of F once it has been set in motion.

II. It may remain at rest.

III. It may accelerate.

IV. It may move with constant speed in a direction opposite to F

4. A person having a mass of 60 kilograms exerts a horizontal force of 200 newtons in pushing a 90 kilogram object a distance of 6 meters along a horizontal floor. He does this at constant velocity in 3 seconds. The weight of this person is approximately, in newtons: (g=9.8 m/s^ 2 )

5. If 500 cm^3 of gas, having a pressure of 760 millimeters of mercury, is compressed into a volume of 300 cm^3 , the temperature remaining constant, the pressure of the gas will be, in millimeters of mercury, approximately: _

6. Two springs fixed at one end are stretched by 5 cm and 10 cm, respectively, when masses 0.5 kg and 1 kg are suspended at their lower ends. When displaced slightly from their mean positions and released, they will oscillate with time periods in the ratio:

7. A unit of induction is said to exist at a point where the force per unit charge experienced by a positive test charge, moving with a velocity of 1 ms^-1 in the direction perpendicular to the field is 1 Newton.

8. ____ is a positively charged particle with properties similar to the α-particle. Its mass is one fourth and charge is one half of that of an α -particle. It is smaller in size and carries less energy at the same velocity.

9. ____is defined as the sensation that sound produces in the ear of a listener and is clearly related to the frequency of sound. Frequency and ____ are both measured in Hertz (Hz). Thus greater the frequency the greater the ____ and lower the frequency lower the ____.

10. Light can be polarized by:

I. Reflection

II. Double refraction

III. Scattering of light