Deck 5: Physics and Communication

Question 1

If an object moves a circular distance 's' of radius 'r', then it's angular displacement is {{}}

A)s⁄r
B)r⁄s
C)rs
D)r2s

Answer 1

s⁄r

Question 2

Speed of an object travelling around a circle depends upon

A)angular velocity
B)radius
C)circumference
D)both A and B

Answer 2

both A and B

Question 3

Number of degree a complete circle represents is

A)90°
B)180°
C)270°
D)360°

Answer 3

360°

Question 4

When a body is moving along a circular path, it's velocity is directed towards

A)center
B)normal
C)tangent
D)parallel to circle

Question 5

Speed is unchanged because work done on an object is

A)zero
B)positive
C)negative
D)infinite

Question 6

180° is equal to{{}}

A)2π rad
B)π rad
C)π⁄2rad
D)π⁄4rad

Question 7

For the minute hand of the clock, the angular velocity is equal to {{}}

A)2 rad s^-1
B)3 rad s^-1
C)1 rad s^-1
D)0.00175 rad s^-1

Question 8

105° in radians is equal to

A)2 rad
B)3 rad
C)1.83 rad
D)4.5 rad

Question 9

1 rad is equal to

A)57.3°
B)54°
C)45°
D)90°

Question 10

According to Newton's 2nd law the object's acceleration and centripetal force are

A)at right angles to each other
B)anti parallel to each other
C)make acute angle with each other
D)in same direction

Question 11

A stone whirling in a horizontal circle on the end of string depicts

A)conical pendulum
B)cone
C)pendulum
D)eclipse

Question 12

Centripetal force is directed towards the

A)tangent to circle
B)center
C)normal to circle
D)parallel to circle

Question 13

Velocity required by an object to orbit around Earth is{{}}

A)9 km s^-1
B)7 km s^-1
C)8 km s^-1
D)10 km s^-1

Question 14

As compared to sound waves the frequency of radio waves is

A)lower
B)higher
C)equal
D)may be higher or lower

Question 15

Decrease in strength of signal is known as

A)tuning
B)modulation
C)attenuation
D)amplification

Question 16

If frequency of modulated wave is less than frequency of carrier wave, then input signal is

A)negative
B)positive
C)zero
D)infinite

Question 17

At the end of communication system, the signal is converted from radio to

A)sound
B)mechanical energy
C)kinetic energy
D)potential energy

Question 18

Energy is lost in wires due to

A)heating
B)resistance
C)conduction
D)both A and B

Question 19

Voltage signal generated by a microphone is

A)digital in nature
B)analogue in nature
C)consists of bits and bytes
D)hybrid in nature

Question 20

Phenomena in which signal transmitted in one circuit creates undesired effect in other circuit is known as

A)crosstalk
B)signal attenuation
C)sampling
D)crosslinking

Question 21

Digital number 9 can be represented in binary number as

A)110
B)1001
C)1010
D)1011

Question 22

Geostationary satellite has period

A)twice of Earth
B)same as Earth
C)half of Earth
D)quarter of Earth

Question 23

Bit on left hand side has

A)lowest value
B)zero value
C)highest value
D)infinite value

Question 24

A digital quantity has

A)only 2 values
B)more than 2 values
C)no values
D)less than 2 values

Question 25

Frequency of sky waves is

A)less then 3 MHz
B)more than 3 MHz
C)less than 2 MHz
D)exactly 2 MHz