Question 1A bridge 100m long weighs 500kN. A lorry weighing 100kN is 25m from one end of it. Find the force exerted at this support. A.350kNB.300kNC.328kND.325kNObjective Show full explanation
Question 2What is the kinetic energy of a rock of mass 220g after it has fallen freely for 5 seconds? g= 10m/s2 A.35oJB.225JC.275JD.250JObjective Show full explanation
Question 3When equal masses of iron and water are given equal quantity of heat, the piece of iron becomes much hotter than water after a shorter time because: A.The specific heat of iron is higher than that of waterB.The specific heat of iron is lower than that of waterC.Iron is in solid state water is in liquid stateD.Heat flows faster in solidsObjective Show full explanation
Question 4The speed of light in air is 3.0 x 108 What is its speed in glass having refractive index of 1.65? A.6.0 X 108m/sB.4.95 X 108m/sC.1.65 X 108m/sD.1.82 X 108m/sObjective Show full explanation
Question 5Atmospheric pressure is 1.0 x 105 N/m2, if the barometer liquid has a density of 1250 kg/m3, what is the minimum length of the tube required? g= 10m/s2. A.7.8mB.0.76mC.8.0mD.10mObjective Show full explanation
Question 6Young's modulus for steel is 2 x 1011 N/m2. A weight of 100N hangs from a steel wire of length 3m and cross-sectional area 1.5 x 10-6 m2. Calculate the extension produced A.1mmB.1.5mmC.0.1mmD.0.15mmObjective Show full explanation
Question 7A load of 50N is attached to one end of a long vertical wire of length 4m and diameter 2.4mm whose other end is fixed it the extension is 0.25mm, calculate the Young modulus of the material of the wire. A.18N/m2B.1800N/m2C.180N/m2D.1.8 × 1011N/m²Objective Show full explanation
Question 8Which of the following statements is not true about the center of gravity of a body? A.The centre of gravity of a body is the point where the resultant force of attraction or weight of the body actsB.The lower the centre of gravity of a body, the more stable the body isC.The higher the centre of gravity of a body the more stable the body isD.It is the point at which the weight of the body appears to be actingObjective Show full explanation
Question 9A car travels with a constant velocity of 45km/h for 10s . What is the distance it covers in this time? A.450mB.400mC.125mD.45mObjective Show full explanation
Question 10A body is projected vertically upwards with a velocity of 9.78m/s. How high does it travel before it comes to rest momentarily: the top of its motion? A.4.89mB.500mC.48mD.9.78mObjective Show full explanation
Question 11Which of the following statements is not true about the friction force? A.Friction always act in such a direction that oppose motionB.The limiting frictional force is dependent on the area of contact of the two surfacesC.Until motion takes place, the frictionally force is always equal to the three tending to produce the motionD.When motion takes place, the friction force is less than its limiting value.Objective Show full explanation
Question 12A solid of mass 1 kg suspended by a string, is completely immersed in water. If the tension in the string is 5N, calculate the upthrust on the solid if g = 9. 78m/s2 A.8.0NB.4.78NC.47ND.9.78NObjective Show full explanation
Question 13The resistance of a piece of wire of length 20m, cross-sectional area 8.0 x 10-6m2 and resisitivity 4.0 X 10-7 is:A.0.5WB.1.0WC.5.0WD.10.0WObjective Show full explanation
Question 14A force of 0.6N acts on a body of mass 40kg, initially at rest. What is the resulting acceleration?A.24m/s2B.0.6m/s2C.40m/s2D.15m/s2Objective Show full explanation
Question 15An object of mass 10kg is pulled over a rough surface by a 20N force. The object accelerates at a rate of 1.5m/s2. Determine the frictional forc e between the object and the surface. A.30NB.20NC.2ND.5NObjective Show full explanation
Question 16A body of mass 2kg, moving with velocity 5m/s collides with stationary body of mass 0.5kg if the two bodies move together after impact, calculate their common velocity. A.10m/sB.4m/sC.2.5m/sD.0.5m/sObjective Show full explanation
Question 17A body of mass 200g and specific heat capacity 0.41/g.K cools from 37°C to 31°C. Calculate the quantity of heat released by the body. A.4800JB.1200JC.480JD.202JObjective Show full explanation
Question 18The length of mercury thread when it is at 0°C, 100°C and unknown temperature X°C is 200mm, 220mm and 27Omm respectively. Determine the value of X. A.350°CB.57°CC.133°CD.300°CObjective Show full explanation
Question 19The linear expansivity of a substance 1.2 X 10-4K. A cube of this substance has a volume of 8.0 X 103 cm3 at 30°C Calculate the increase in its volume at 80°C A.48cm3B.24cm3C.96cm3D.72cm3Objective Show full explanation
Question 20At what temperature will the volume of a given ideal gas be three times its volume at 0°C? A.273°CB.300°CC.546°CD.819°CObjective Show full explanation