Physics Multiple Choice Questions PDF

Multiple choice questions 1. In the given figure, if W=12N and W1 = 40 N. The force exerted on the elbow is; a. 264 N b. 96 N c. 168N d. None of these 2. Find the force F2 on the tooth in figure, if the applied force F= 2...

Multiple choice questions 1. In the given figure, if W=12N and W1 = 40 N. The force exerted on the elbow is; a. 264 N b. 96 N c. 168N d. None of these 2. Find the force F2 on the tooth in figure, if the applied force F= 2 N and θ = 60̊. a. 0.25 N b. 1.5 N c. 0.5 N d. None of these 3. A fluid is undergoing “incompressible” flow. This means that: a. the pressure at a given point cannot change with time b. the velocity at a given point cannot change with time c. the density cannot change with time or location d. the pressure must be the same everywhere 4. Static equilibrium of rigid body means. a.  F = 0 b.  = 0 c. a and b d. None of these 5. The pressure exerted by man on the earth is minimum when……… a. Stands on his feet b. Sits with folded legs c. Sleeps on the ground d. Stands on one foot 6. The height difference between the brain and foot for an adult is 160 cm. If the pressure in the brain is 12 kPa, the pressure in his foot is: a. 7.235 kPa b. 28.952 kPa c. 6.333 kPa d. None of these 7. Water flows from a 6.0 cm diameter pipe into an 8.0 cm diameter pipe. The speed in the 6.0 cm pipe is 5.0 m/s. The speed in the 8.0 cm pipe is: a. 2.8 m/s b. 3.7 m/s c. 6.6 m/s d. None of these 8. Calculate the Torque at the pivot (root) due to 1 N force. a) 1 N.m b) 0.03 N.m c) Zero d) None of these 9. Calculate the Torque at the pivot (root) due to 1 N force. a) Zero b) 0.015 N.m c) 0.026 N.m d) None of these 10. A man‫׳‬s leg can be thought of as a shaft of bone 1.2 m long. If the strain is 1.3x10-4 when the leg supports his weight, by how much is his leg shortened? ε = Strain = Δ L / Lo Δ L = (1.3x10-4 ) ( 1.2) = 1.56 x 10-4 m = 0.156 mm 11. Stress can be measured in: A. N/m2 B. N·m2 C. N/m D. N·m E. none of these (it is unitless) 12. Strain can be measured in: A. N/m2 B. N·m2 C. N/m D. N·m E. none of these (it is unitless)  13. Young’s modulus can be correctly given in: A. N·m B. N/m2 C. N·m/s D. N/m E. joules 14. The ultimate strength of a sample is the stress at which the sample: A. returns to its original shape when the stress is removed B. remains underwater C. breaks D. bends 180◦ E. does none of these 15. The vessels shown below all contain water to the same height. Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest. A. 1, 2, 3, 4 B. 3, 4, 2, 1 C. 4, 3, 2, 1 D. 2, 3, 4, 1 E. All pressures are the same 16. What is the total force on the bottom of a 2.0-m-diameter by 1.0-m-deep round wading pool due to the weight of the air and the weight of the water? (Note the pressure contribution from the atmosphere is 1.0  105 N/m2, the density of water is 1 000 kg/m3, and g = 9.8 m/s2.) a. 3.4  105 N b. 2.4  106 N c. 3.2  106 N d. 6.0  106 N 17. A 5.0  102-N object is hung from the end of a wire of cross-sectional area 0.010 cm2. The wire stretches from its original length of 200.00 cm to 200.50 cm. What is the stress on the wire? (a) 5.0  102 N/m2 (c) 1.0  108 N/m2 (e)5.0  108 N/m2  (b) 1.0  106 N/m2 (d) 5.0  106 N/m2 What is the elongation strain on the wire? (a) 1.0  102 (c) 5.0  102 (e)4.0  102 (b) 1.0  10−2 (d) 2.5  10−3 Determine the Young's modulus of the wire. (a) 1.0  1011 N/m2 (c) 2.0  1011 N/m2 (e)5.0  1012 N/m2 (b) 1.0  109 N/m2 (d) 2.0  109 N/m2 18. One end of a cylindrical pipe has a radius of 1.5 cm. Water (density = 1.0×103 kg/m3) streams steadily out at 7.0m/s. The volume flow rate is: A. 4.9 × 10−3m3/s B. 2.5m3/s C. 4.9m3/s D. 7.0m3/s E. 48m3/s 19. A constriction in a pipe reduces its diameter from 4.0 cm to 2.0 cm. Where the pipe is narrow the water speed is 8.0m/s. Where it is wide the water speed is: A. 2.0m/s B. 4.0m/s C. 8.0m/s D. 16m/s 20. Which of the following assumptions is NOT made in the derivation of Bernoulli’s equation? A. Assume streamline flow B. Neglect viscosity C. Neglect friction D. Neglect gravity E. Neglect turbulence 21. Water is pumped through the hose shown below, from a lower level to an upper level. Comparedto the water at point 1, the water at point 2: A. has greater speed and greater pressure B. has greater speed and less pressure C. has less speed and less pressure D. has less speed and greater pressure E. has greater speed and the same pressure