Q. The product of energy and time is called action. The dimensional formula for action is same as that for Power Angular energy Force × velocity Impulse × distance Answer: Impulse × distance
Q. Which is the most accurate atomic clock? Carbon-12 clock Carbon atom clock Caesium atom clock Stop clock Answer: Caesium atom clock
Q. Which pair of following quantities has dimensions different from each other Impulse and linear momentum Plank’s constant and angular momentum Moment of inertia and moment of force Young’s modulus and pressure Answer: Moment of inertia and moment of force
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Q. After decimal point, number is less than 5 which is to be neglected,then retained number gets increased get decreased remains unchanged may decreased Answer: remains unchanged
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Q. Planck’s constant has the dimensions of : force energy linear momentum angular momentum Answer: angular momentum
Q. Which of the following is not the unit of time solar day parallactic second leap year lunar month Answer: parallactic second
Q. A dimensionless quantity has no unit must have a unit cannot exist May have a unit Answer: May have a unit
Q. Find the option with 3 significant figures. 0.0268 2.068 2.608 26.08 Answer: 0.0268
Q. Which of the following is not the unit of energy? watt-hour electron-volt N × m kg × m/sec Answer: kg × m/sec
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Q. In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= 0.5°), then the least count of the instrument is One minute Half minute One
