Practice Test 2 in LET Physical Science

Practice Test #2 in LET Physical Science

1. The radius of the path of an object in uniform circular motion is doubled. The centripetal force needed if its speed remains the same is ________. A. Four times as before B. Half as great as before C. Twice as much D. Three times as much 2. Car A has a mass of 1000kg and a speed of 60km/hr. car B has amass of 2000kg 2000kg and a speed of of 30km/hr. compare the kinetic energy foe car A with that of car B. A. Half as much B. Four times as much C. Equal D. Twice as much 3. What would be the horizontal line in a position-time graph means? A. Changing position, position, constant velocity B. Constant position, constant constant velocity C. Changing position, position, increase velocity D. Constant position, zero velocity

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4. What is the car’s acceleration if ten seconds after the starting from rest; it is moving at 40m/s? A. 4.0m/s2 B. 10m/s2 C. 2.5m/s2 D. 0.25m/s2 5. A 5. A heavy heavy object object and and a light light obje object ct are released released from from the the rest at the same height and time in a vacuum. As they fall, they have equal _____ ________. ___. A. Weights B. Moments C. Accelerat C. Acceleration ion D. Energies 6. Airplanes 6. Airplanes are designed designed wit with pointed pointed nose nose and and thin tails tails in in order order to__________. A. Produce fluid friction B. Reduce drag C. Increase the lift of the wing D. Lessen Lessen the forward forward thrust 7. A 7. A stone stone was thrown thrown upward upward from from the the roof, roof, at the the same time that that an an identical stone was dropped dropped from there. The two stones will _____ ________. ___. A. Have the same same velocity upon reaching the ground B. Take the same time to reach the ground C. Have they same acceleration when they reach the ground D. Reach the th e ground ground at the th e same time



B. Screw C. Tip of the blades D. Sharp edges 9. What kind of energy is possessed by water falling from a dam? A. Potential B. Kinetic C. Accelerat C. Acceleratin ing g D. Interacting 10. 10. If an object were equipped with a speedometer and allowed to fall freely on a planet where the acceleration due to gravity is 20m/s2, by, how much will the reading reading on the speedomete sp eedometerr increase in crease each second? second? A. 30m/s B. 20m/s C. 40m/s D. 10m/s 11. Accordi 11. According ng to the kinetic kinetic molecular molecular theory, theory, liquids liquids are are similar similar in solids solids in that _______. A. Their molecules are arrange arrange in a regular manner B. The motion of their particles changes with temperature C. The motion of their particles ca c annot be determined D. There is very little space in their molecules 12. When the solid solid block of materials ma terials is cut in half, its density is ___ ________. _____. A. Unchanged B. Halves C. Doubled D. Tripled



A. Trajectory B. Projectile C. Range D. Hyperbola 14. 14. Which of the th e following following is TRUE about an object thrown horizontally? A. The vertical distance traveled increases uniformly B. The horizontal motion is uniformly u niformly accelerated C. The horizontal component of velocity increases D. The velocity of the subject increases 15. 15. In the th e absence absence of the air resistance, a projectile has a maxim ma ximum um ran range ge when thrown at an angle of __________. A. 90 degrees B. 60 degrees C. 30 degrees D. 45 degrees 16. 16. A 400 400 N woman stands on on top of a very tall ladder ladder so she she is one one earth earth radius radiu s above the earth’s earth’s surface. su rface. How much much does she weights? weights? A. 100N B. Zero C. 200N D. 400N 17. 17. What must be the minimum length of the plane mirror in order for you you to see a full fu ll view of yourself? A. Your A. Your full full height height B. One-fourth C. One-half D. Three-fourths



A. The force against the rifle is less B. The rifle has more mass than the bullet C. The impulse on the rifle is less D. The momentum momentum of the rifle r ifle is unchanged. 19. 19. Which statements diffe d ifferentiate rentiate weight for mass? A. Weight is distance d istance from from a reference point B. Weight has volume, mass has none n one C. Weight is a full of gravity, gravity, mass is space occupied occupied D. Weight is a force while mass is amount of matter 20. 20. Who established the relationship between the volume volume of a gas g as and the pressure when the temperature temperature is constant? A. Blaise Pascal B. Robert Boyle C. Lavoisier D. Archime D. Archimedes des

ANSWER KEY 1. 2.

B D

3. D 4. A 5. 6.

C B

7. 8. 9. 10.

C B B B

11. B 12. A 13. C



19. D 20. B

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Practice Test 2 in LET Physical Science

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