Related Questions

Which of the following is NOT true about Frictional force? A. Friction is the force which opposes the relative motion of two surfaces in contact. B. The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction. C. Friction in machines wastes energy and also causes wear and tear. D. Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction.
While discussing about friction, a teacher gave a number of examples to explain the concept. Some of the examples where friction is useful in our day-to-day life as quoted by the teacher are given below : A. We are able to write because of friction between the tip of the pen and the paper. B. We are able to walk because of friction between our feet and the ground. C. A ball thrown vertically upwards comes back to us due to friction. D. We are able to stop a moving vehicle by applying brakes because of friction. The correct examples were
Consider the following statements: 1. The kinetic friction is always less than the rolling friction. 2. The kinetic friction is always equal to the rolling friction. 3. The kinetic friction is always greater than the rolling friction. Which of the following statement is correct?
Which of the following statements is/are incorrect? 1. Gross National Product (GNP) is calculated by adding Net factor income from abroad to Gross Domestic Product (GDP). 2. Gross Value Added (GVA) is the sum of a country’s GDP and net of subsidies and taxes in the economy.
Given bar graph shows, total expenditure and the gross receipts of a company (in Rs. crores). Study the graph and answer the question that follows.   If profit = gross receipts - total expenditure, then in 1997 - 98, what percentage of gross receipts is the profit made? (Correct to one decimal place)
Which of the following is correct about friction? I. Rolling friction is smaller than the sliding friction II. Sliding friction is smaller than static friction 
Which of the following statements regarding laws governing the friction between dry surfaces are correct? 1. The friction force is dependent on the velocity of sliding.  2. The friction force is directly proportional to the normal force. 3. The friction force is dependent on the materials of the contact surfaces. 4. The Friction force is independent of the area of contact surfaces.
Consider the following statements: Polishing helps in increasing friction. Lubricating the machine helps in reducing friction. Usage of ball bearings is an effective way to reduce kinetic friction. Sand is spread over the tracks covered with snow to increase friction. Which of the above statements is correct.
Which of the following statement/s is/are incorrect about Net National Product (NNP)? (a) It shows the net production of goods and services produced in a given financial year adjusted for net factor income from abroad. (b) It includes exports, and imports but does not factor in income from abroad. (c) It is called 'net' because it deducts capital depreciation from total National Income.
At XYZ Company, the ratio of sales to gross profit is 4:3 and the ratio of gross profit to net profit is 3:1, what is the ratio of net profits to sales?