Deck 21: Physics and Measurement

Question 1

Least count of screw gauge is

A)0.01 cm
B)0.5 cm
C)0.1 cm
D)0.01 mm

Answer 1

0.01 mm

Question 2

Increase in kinetic energy of car having mass 800 kg and velocities ranging from 20 m s^-1 to 30 m s^-1 is {{}}

A)300 KJ
B)500 KJ
C)400 KJ
D)200 KJ

Answer 2

200 KJ

Question 3

Work done by a person having weight 600 N and he needs to climb up a mountain of height 2000 m is

A)1000 kJ
B)1300 kJ
C)1400 kJ
D)1200 kJ

Answer 3

1200 kJ

Question 4

Internal resistance of cell when there is current of 0.40 A when a battery of 6.0 V is connected to a resistor of 13.5 Ω is

A)1.5 Ω
B)2.3 Ω
C)3.5 Ω
D)4.5 Ω

Question 5

Barrel of screw gauge has

A)100 divisions
B)50 divisions
C)10 divisions
D)45 divisions

Question 6

A measurement which on repetition gives same or nearly same result is called

A)accurate measurement
B)average measurement
C)precise measurement
D)estimated measurement

Question 7

A motor of the lift provides a force of 20 kN which rises it by 18 m in 10 s, the output power of motor is

A)36 kW
B)46 kW
C)56 kW
D)66 kW

Question 8

Actual range of values around a measurement is called

A)error
B)uncertainty
C)accuracy
D)precision

Question 9

Depth of water in a bottle is 24.3 cm and uncertainty is 0.2 cm, percentage uncertainty in measurement is

A)0.82%
B)9%
C)1%
D)2%

Question 10

While taking the reading, the line of sight should be

A)at acute angle to the scale
B)perpendicular to scale
C)at obtuse angle to the scale
D)parallel to the scale

Question 11

Maximum current a battery of e.m.f 3.0 V and internal resistance 1.0 Ω is

A)4.0 A
B)5.0 A
C)3.0 A
D)30 A

Question 12

In potential dividers, the output voltage depends upon the

A)single resistor
B)relative values of all resistors
C)current
D)temperature

Question 13

Calipers are used to measure the

A)diameter
B)length
C)thickness
D)volume

Question 14

Smallest division on stopwatch is

A)0.1 s
B)0.05 s
C)0.01 s
D)1 s

Question 15

intensity of sun's radiation is about {{}}

A)1.0 kW m^-2
B)20 kW m^-2
C)5 kW m^-2
D)8 kW m^-2

Question 16

When light enters from vacuum in to glass, it's velocity

A)decreases
B)remains same
C)increases
D)varies depending on mass of glass

Question 17

As wave travels, intensity

A)increases
B)remains same
C)decreases
D)varies

Question 18

Waves that move through materials are called

A)progressive waves
B)EM waves
C)radio waves
D)UV waves

Question 19

Speed of sound in air is {{}}

A)280 m s^-1
B)300 m s^-1
C)350 m s^-1
D)330 m s^-1

Question 20

Particles vibrate about their mean positions and transfer

A)frequency
B)wavelength
C)energy
D)power

Question 21

Speed of electromagnetic radiation is independent of

A)wavelength
B)amplitude
C)time period
D)frequency

Question 22

Mechanical waves include

A)sound
B)light
C)EM waves
D)UV waves

Question 23

A complete cycle of wave is around

A)90°
B)180°
C)45°
D)360°

Question 24

Changing magnetic field induces

A)charge
B)current
C)frequency
D)voltage

Question 25

Phase difference is measured in

A)degrees
B)meters
C)seconds
D)newton