a) Resistance is connected in series b) Resistance is connected in parallel c) It does not matter d) It differs from one position to the other

Transcription

1 Physics 1. Two men carry a weight of 800 Newton. The weight is carried by a stick 1 meter long. If the weight is 40 cm from one man, what is the force need to be applied by each man, to keep the stick horizontal? a) 320 N, 480 N b) 340 N, 520 N c) 360 N, 540 N d) 380 N, 560 N 2. The total current resistance is bigger when : a) Resistance is connected in series b) Resistance is connected in parallel c) It does not matter d) It differs from one position to the other 3. A Truck is pulled by a rope horizontally. The mass of the truck is 200kg and the tension in the rope is 500N. Assuming the initial velocity to be zero, how long will it take the truck to reach a speed of 8m/s. Ignore the friction : a) 2 second b) 4.5 second c) 3.2 second d) 6.1 second 4. A golf ball is thrown at an angle of 37 o with the horizontal with initial speed of 50 m/s. The maximum horizontal distance is: a) 480 m b) 240 m c) 180 m d) 420 m 5. A Body (A) moving with a speed of 250 m/s in the positive x-direction collides with body (B) initially at rest and having same mass as (A). After the collision the speed of body (A) is 100 m/s making 30 o with the horizontal. The speed and direction of body (B) after the collision is:

2 a) 50 m/s f = 71 o b) 25 m/s f = 30 o c) 171 m/s f = 17 o d) 342 m/s f = 34 o 6. A rod of iron has length of 50cm at 20 o C. When it is heated to 120 o C its length become cm. The coefficient of linear expansion of the rod is: a) 12 x 10-6 C o-1 b) 14 x 10-6 C o-1 c) 18 x 10-6 C o-1 d) 36 x 10-6 C o-1 7. An iron ring of diameter 4 cm at 25 o and a cylinder of diameter 4.002cm is made of the same material at the same temperature. To what temperature the ring should be heated so that the cylinder passes through the ring easily. a) 41.6 o C b) 66.6 o C c) 32.6 o C d) 76.6 o C 8. A child of mass 20kg has a temperature of 40 o. If the specific heat capacity of human body is approximately 3.47 J/g. o c, the amount of heat that needs to be drawn out of his body to reach the normal body temperature of 37 o is: a) 3.47 x 10 5 J b) x 10 5 J c) x 10 5 J d) 2.08 x 10 5 J 9. A copper container of mass 80g contains 60g of a liquid at 20 o C. A piece of copper of mass 100g and temperature 100 o C is dropped into the liquid. If the final temp. of the system is 59.7 o C, then the specific heat capacity of the liquid is: (Note : specific heat capacity of copper is cal/g. o C) a) 1 cal /g. o C b) cal/g. o C

3 c) cal/g/ o C d) cal/g. o C 10. A transformer has 200 turns in its primary coil. The potential difference across the transformer is 220v needs to operate an electrical instrument uses a 110 volts. The number of turns in its secondary coil is: a) 100 turns b) 200 turns c) 110 turns d) 220 turns 11. Convex lenses are used to correct: a) Short sight b) Long sight c) Both short and long sights d) To correct the vision angle 12. Which of the following electromognetic waves can be produced, when high-energy electrons strike a target of heavy metal in an evacuated tube? a) Gamma rays b) X-rays c) Ultra-violet rays d) Radio waves 13. To have the biggest projectile, the angle should be: a) As big as possible b) 45 degrees c) 10 degrees d) 1 degree 14. A 20N object falls 10 meters, how many Joules of kinetic energy does the object gain? a) 10 b) 20 c) 200 d) If two waves mix while moving, will one delay the other?

4 a) Yes b) No c) Sometimes d) Only for sound waves 16. Find the tension in the rope in the figure shown below, knowing that the weight of the body is 50 Newton a) 40 Newton b) 50 Newton c) -50 Newton d) -40 Newton 17. In the figure below, PQ is a uniform beam of length equal to 4m, which is resting on supports at R, 1m from P, and at S, 1m from Q. If the beam has a weight equal to 150N, what would be the minimum downward force, F, applied at Q which would lift the beam clear of the support at R? a) 150 N b) 100 N c) 75 N d) 50 N 18. The kilowatt hour is a unit of: a) Power b) Force c) Velocity d) Work and energy

5 19. A beam weighs 200N carrying a weight of 450N. Find the forces F 1, F 2? a) 200N, 450N b) 300N, 450N c) 216N, 426N d) 212N, 438N 20. The unit of electrical current is: a) colom.sec b) colom/sec 2 c) Ampere d) Ampere/sec