OPEN BOOK TEST

The length of a body is measured as 3.51 m, if the accuracy is 0.01m, then the percentage error in the measurement is

• a) 351%

• b) 1%

• c) 0.28%

• d) 0.035%

The density of a material in CGS system of units is 4g/cm . In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be

• a) 0.4

• b) 40

• c) 400

• d) 0.04

Which of the following pairs of physical quantities have the same dimension?

• a) force and power

• b) torque and energy

• c) torque and power

• d) force and torque

Which one of the following physical quantities cannot be represented by a scalar?

• a) Mass

• b) length

• c) momentum

• d) magnitude of acceleration

Force acting on the particle moving with constant speed is

• a) always zero

• b) need not be zero

• c) always non zero

• d) cannot be concluded

If a particle executes uniform circular motion in the xy plane in clock wise direction, then the angular velocity is in

• a) +Y direction

• b) +Z direction

• c) -Z direction

• d) -X direction

The dimensional formula of Planck's constant h is

• a) [ML²T ^-1 ]

• b) [ML²T ^-3 ]

• c) [MLT^-1]

• d) [ML³T^-3 ]

Light year is

• a) light emitted by the sun in one year.

• b) time taken by light to travel from sun to earth.

• c) the distance travelled by light in free space in one year.

• d) time taken by earth to go once around the sun.

The dimensional formula for relative density is

• a) [M L^-3 ]

• b) [M⁰ L^-3]

• c) [M⁰L0 T^-1 ]

• d) [M⁰ L⁰ T⁰ ]

Illuminance of a surface is measured in

• a) Lumen

• b) candela

• c) lux

• d) lux m