101.A quantity is defined as the product of cross-sectional area and change in momentum per unit length. Which of the following is its SI unit?
- A. Nm
- B. kgs⁻¹
- C. kgm²s⁻¹
- D. Nkgs⁻¹
102.A rectangular concrete block 40 cm x 30 cm x 60 cm of mass 10 kg rests on a horizontal flat surface. What is the minimum pressure it can possibly exert on the surface?
- A. 816.6 Nm⁻²
- B. 816. 6 Nm²
- C. 408.3 Nm⁻²
- D. 608.4 Nm
103.A simple hydrometer consists of uniform cylinder suitably weighted to float upright in most common liquids. It is graduated to read the relative density of a liquid directly. Which of the following is NOT correct?
- A. When placed in a liquid, it displaces exactly its own weight of the liquid
- B. Its graduation increases from top to base
- C. When placed in a liquid, it displaces exactly its own volume of the liquid
- D. The product of the volume and density of liquid displaced is equal to its mass
104.A stone which is dropped into a dry well hits the bottom in 2.2 s. How deep is the well? (Take g=10m/s)
- A. 40.4 m
- B. 2.4 m
- C. 48.4 m
- D. 24.2 m
105.A woman whose mass is 70 kg sits 2.4 m from the fulcrum of a seesaw. At what distance from the fulcrum should a 60 kg man sit to balance the seesaw?
- A. 2.8 m
- B. 2.4 m
- C. 3.2 m
- D. 3.8 m
106.An air bubble trapped at a depth in a liquid rises to the surface. Which of the following is true about its mass and density as it rises?.
- A. Its mass and density increase
- B. Its mass is constant while its density decreases
- C. Its mass and density is constant
- D. Its mass is constant while its density increases
107.Complete the following sentence: The operation of a hydraulic jack is an application of
- A. Pascal's principle
- B. Archimedes’ principle
- C. Bernoulli's principle
- D. irrotational flow
108.Complete the following statement: Today, the standard meter is defined in terms of
- A. the distance from the earth’s equator to the north pole
- B. the wavelength of light emitted from a krypton atom.
- C. the wavelength of light emitted from a sodium atom
- D. the speed of light
109.Convert 30 metre per second to centimeter per minute
- A. 20,000 cm/min
- B. 180,000 cm/min
- C. 120,000 cm/min
- D. 150,000 cm/min
110.During a football match, player A kicks the ball 40 m, 30° E of S to player B who instantly kicks it 30 m, 60° E of N. What is the magnitude of the resultant displacement of the ball?
- A. 30 m
- B. 40 m
- C. 50 m
- D. 60 m
111.How much work is done against gravity in sliding a 500g object through 2 m up a smooth plane that is inclined at 30° to the horizontal? (g = 9.8 ms-2)
- A. 9.8 J
- B. 19.8 J
- C. 16.2 J
- D. 4.9 J
112.. If a small body of mass m is moving with angular velocity ω in a circle of radius r, what is its kinetic energy?
- A. mωr
- B. mω²r/2
- C. mωr²/2
- D. mω²r²/2
113.In free fall, two balls of masses 20 kg and 10 kg were dropped from a height. If the ball with the smaller mass reached the ground after 4 s, what is the difference between the time the two balls reach the ground?
114.In what distance can a 1,500 kg automobile be stopped if the brake is applied when the speed is 20 m/s and the coefficient of sliding friction is 0.7 between the tyres and the ground?
- A. 98.10 m
- B. 71.67 m
- C. 29.15 m
- D. 20.10 m
115.The highest point of a simple pendulum bob is 5cm vertically above the lowest point as it swings to and fro between the two extreme ends. At what velocity does it swing past the lowest point (equilibrium point) where the string is vertical? (take g = 10 m/s2)
- A. 1 m/s
- B. 2 m/s
- C. 5 m/s
- D. 10 m/s
116.Three vectors A, B, and C add together to yield zero: A + B + C = 0. The vectors A and C point in opposite directions and their magnitudes are related by the expression: A = 2C. Which one of the following conclusions is correct?
- A. A and B have equal magnitudes and point in opposite directions
- B. B and C have equal magnitudes and point in the same direction
- C. B and C have equal magnitudes and point in opposite directions
- D. A and B point in the same direction, but A has twice the magnitude of B
117.Which of the following could be measured in the same units as force?
- A. Energy/distance
- B. Energy x distance
- C. Energy/time
- D. Momentum x distance
118.Which of the following does not affect the pressure at a point beneath the surface of a liquid?
- A. Surface area of the liquid
- B. Density of the liquid
- C. Depth of the point below the surface
- D. Strength of the gravitational field
119.Which of the following pairs contains one vector and one scalar quantity?
- A. Displacement: acceleration
- B. Force : kinetic energy
- C. Momentum : velocity
- D. Power : speed
120.Which of the following statements is correct
- A. uniform speed always implies uniform velocity
- B. uniform speed always implies zero acceleration
- C. uniform speed may imply nonzero acceleration
- D. constant momentum implies constant acceleration