Question Detail The rotational effect of a force on a body about an axis of rotation is described in terms of Centre of gravityCentripetal forceCentrifugal forceMoment of force Answer: Option D Similar Questions : 1. Siphon will fail to work if both its limbs are of unequal lengththe temperature of the liquids in the two vessels are the samethe level of the liquid in the two vessels are at the same heightthe densities of the liquid in the two vessels are equal Answer: Option C 2. Which instrument is used to measure pressure of gases ? ManometerMachmeterMagnetometerMicrometer Answer: Option AExplanation:Machmeter - is used to determine the speed of an aircraft in terms of speed of sound, Magnetometer - is used to compare magnetic movements and fields, Micrometer - is used to convert sound waves into electrical vibrations. 3. What is Hooke's Law ? Stress is inversely proportional to strain.Stress is directly proportional to strain.Stress and strain are dependent on each other.Stress and strain are independent of each other. Answer: Option B 4. Which instrument is used to measure the scattering of light by particles suspended in a liquid ? NephetometerOhmmeterOndometerPyrometer Answer: Option AExplanation:Ohmmeter - is used to measure electrical resistance in ohms, Ondometer - is used to measure frequency of electromagnetic waves, Pyrometer - is used to measure very high temperature. 5. If lift is going up with acceleration, the apparent weight of a body is may be more or less than true weightequal to the true weightless than the true weightmore than the true weight Answer: Option D Read more from - Physics Questions Answers