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L6th Homework Quiz 2

Total questions: 50

Worksheet time: 13hrs 30mins

Name
Class
Date
1.

Which of the following is a scalar quantity?

a)

velocity

b)

kinetic energy

c)

force

d)

momentum

2.

Three identical cells, each of internal resistance R, are connected in series with an external resistor of resistance R. The current in the external resistor is I. If one cell is reversed in the circuit, what is the new current in the external resistor?

a)

I3\frac{I}{3}

b)

4I9\frac{4I}{9}

c)

I2\frac{I}{2}

d)

2I3\frac{2I}{3}

3.

A cylindrical conductor of length l, diameter D, and resistivity  ρ\rho   and has resistance R. What is the resistance of another electrical conductor of length l, diameter  D2\frac{D}{2}  , and resistivity  ρ\rho  ?

a)

8R

b)

4R

c)

2R

d)

R

4.

Which of the following is NOT a unit for power?

a)

Nms-1

b)

kgm2s-3

c)

Js-1

d)

kgm-1s-1

5.

Two forces, 6N and 10N act at a point. Which could NOT be a magnitude of the result?

a)

16 N

b)

8 N

c)

5 N

d)

3 N

6.

The unit of potential difference can be expressed as

a)

Cs-1

b)

JC-1

c)

VA-1

d)

JA-1

7.

A skydiver of mass 80 kg falls vertically with a constant speed of 50 m s–1. The upward force acting on the skydiver is approximately

a)

0 N

b)

80 N

c)

800 N

d)

4000 N

8.

A wooden block is sliding down an inclined plane at constant speed. The magnitude of the frictional force between the block and the plane is equal to

a)

zero.

b)

the magnitude of the weight of the block.

c)

the magnitude of the component of weight of the block parallel to the plane.

d)

the magnitude of the component of the normal reaction parallel to the plane

9.

Which of the following is a correct statement of Newton’s second law of motion?

a)

A force acting on a body is proportional to the mass of the body.

b)

The rate of change of momentum of a body is equal to the net external force acting on the body.

c)

The momentum of a body is proportional to the net external force acting on the body.

d)

A force acting on a body is proportional to the acceleration of the body.

10.

Which of the following quantities can be determined from a speed-time graph of a particle travelling in a straight line?

a)

Only the magnitude of the acceleration at a given instant

b)

Both the velocity and the acceleration at a given instant

c)

Only the distance travelled in a given time

d)

Both the distance travelled in a given time and the magnitude of the acceleration at a given instant

11.

Which of the following may be determined from a speed-time graph?

a)

Displacement

b)

Distance

c)

Power

d)

Force

12.
Mains electricity in the UK operates at 
a)
230 V and 50 Hz
b)
120 V and 50 Hz
c)
230 V and 80 Hz
d)
120 V and 80 Hz
13.
A circuit that has AC current that switches polarity every 0.10 seconds is said to have a frequency of 
a)
5 Hz
b)
10 Hz
c)
0.1 Hz
d)
0.2 Hz
14.
A security light with a 5 Ω resistor, a 2 Ω lamp and an LDR which currently has 2 Ω of resistance would have a total resitance of 
a)
9 Ω
b)
7 Ω
c)
2 Ω
d)
1 Ω
15.
As the temperature increases, the resistance of a resistor
a)
remains the same
b)
increases
c)
decreases
16.

If a copper wire is stretched to make it 0.1% longer, then the % change in resistance is : approx

a)

0.1 %

b)

0.2 %

c)

0.4 %

d)

0.8 %

17.

If the resistivity of a potentiometer wire is ρ and area of cross- section is A, then the potential gradient along the wire is :

a)

I ρ / A

b)

I / ρ A

c)

I A / ρ

d)

I A ρ

18.

What is the voltage in a circuit with a current of 3 A and a total resistance of 12 ohms?

a)

0.25 V

b)

4 V

c)

15 V

d)

36 V

19.

The measurements in the table above are from four circuits that each have the same components except for the battery. Which of the following statements describes how voltage, current, and resistance are related by Ohm’s law

in these circuits?

a)

As voltage increases, current decreases and resistance decreases.

b)

As voltage increases, current increases and resistance stays

the same.

c)

As voltage increases, current decreases and resistance stays

the same.

d)

As voltage increases, current stays the same and resistance decreases.

20.

A student creates a circuit with a variable voltage supply and a 2 ohm resistor. The student varies the voltage and measures the current. The graph shows the student’s results. What was the greatest power supplied by the battery?

a)

2 W

b)

4 W

c)

8 W

d)

16 W

21.

What is the primary difference between insulators and conductors?

a)

Electrons are present in insulators but not in conductors.

b)

Electrons are present in conductors but not in insulators.

c)

Electrons are free to move in insulators but not in conductors.

d)

Electrons are free to move in conductors but not in insulators.

22.

Which of the following circuits has the greatest current?

a)
b)
c)
d)
23.

The diagram shows a parallel circuit with a 4 ohm resistor and a 12 ohm resistor. The voltage between points X

and Y is 16 V. What is the voltage across the 12 ohm resistor?

a)

12 V

b)

16 V

c)

36 V

d)

64 V

24.

The graph below shows the relationship of voltage versus current for a circuit. This graph represents the relationship

described by which of the following laws?

a)

Coulomb’s law

b)

Doppler’s law

c)

Newton’s law

d)

Ohm’s law

25.
What happens to a resistor when the temperature is increased?
a)
Increases
b)
decreases
c)
stay the same
d)
vary randomly
26.
Factor which does not affect the resistance
a)
Type of material
b)
Length of material
c)
Mass of the material
d)
Area of the material
27.
Graph shows that _____________
a)
Resistance is directly proportional to Area
b)
Resistance is inversely proportional to Area
c)
Resistance is a constant while Area changes.
d)
Area is a constant while resistance changes.
28.

Select the correct equations

a)

R=IVR=\frac{I}{V}

b)

R=I2PR=\frac{I^2}{P}

c)

R=V2PR=V^2P

d)

R=VIR=\frac{V}{I}

e)

R=PI2R=\frac{P}{I^2}

29.

Which one's wrong?

a)

v = u + at

b)

v  ^2    = u ^2   + 2as

c)

s = ut + at ^2   / 2

d)

s = u + v /2

30.

These moments would be in equilibrium when...

a)

d1 + f1 = d2 +f2

b)

d1 - f1 = d2 - f2

c)

d1 x f1 = d2 x f2

d)

d1 x f2 - d2 x f2

31.

What is an elastic collision?

a)

kinetic energy is conserved, energy transferred to surroundings

b)

kinetic energy is not conserved, no energy transferred to surroundings

c)

kinetic energy is not conserved, no energy transferred to surroundings

d)

kinetic energy is conserved, no energy transferred to surroundings

32.

What is an inelastic collision?

a)

kinetic energy is not conserved, energy is transferred to the surroundings

b)

kinetic energy is not conserved, no energy transferred to surroundings

c)

kinetic energy is conserved, no energy is transferred to surroudnings

d)

kinetic energy is conserved, energy transferred to surroudings

33.

Match the factor with the prefix name: 1012

a)

peta

b)

tera

c)

yotta

d)

zetta

34.

Match the prefix name with the factor: pico

a)

10-18

b)

10-16

c)

10-15

d)

10-12

35.

At a given time, an object is experiencing one force. What can be concluded? (Select all that apply.)

a)

The object is experiencing a net force.

b)

The object is in equilibrium.

c)

The object is moving.

d)

The object's velocity is changing.

e)

The object is accelerating.

36.

At a given time, an object is sliding up a frictionless inclined plane. What can be concluded? (Select all that apply.)

a)

The object is slowing down at that time.

b)

The magnitude of the normal force on the object is equal to the magnitude of the object's weight.

c)

The magnitude of the net force on the object is equal to the magnitude of the object's weight.

d)

The magnitude of the normal force on the object is less than the magnitude of the object's weight.

e)

The magnitude of the net force on the object is less than the magnitude of the object's weight.

37.

Which of the following expressions givens units of m/s2? (Select all that apply.)

a)

F / m

b)

mv2 / 2

c)

v2 / (2h)

d)

Fvt

e)

2y / t2

38.

A rope is attached to an object and used to lift the object directly upward at constant speed? What can be concluded? (Select all that apply.)

a)

The object is in equilibrium.

b)

The magnitude of the rope's tension is greater than the magnitude of the object's weight.

c)

The magnitude of the rope's tension is less than the magnitude of the object's weight.

d)

The magnitude of the rope's tension is equal to the magnitude of the object's weight.

e)

The force of tension on the object and the force of gravity on the object comprise an action-reaction pair.

39.

Sound waves travel as ________ waves.

a)

Transverse

b)

Longitudinal

c)

Surface

40.
All waves carry
a)
energy
b)
matter
c)
light
d)
water
41.
_____________ is the HEIGHT of the wave.
a)
frequency
b)
speed
c)
amplitude
d)
wavelength
42.

Green light is passed through a diffraction grating

with 5000 lines per mm and bright fringes are

observed on a screen 2 m away. Which of the

following would increase the fringe spacing on the

screen?


I. Increasing the frequency of light to blue light

II. Replacing the grating with a grating having

7000 lines per mm

III. Moving the screen closer to 1.5 m from the

grating

a)

I only

b)

II only

c)

III only

d)

I and II only

43.

Polarization of light can be achieved using a

material like a Polaroid by which of the following

processes?

a)

Reflection

b)

Double refraction

c)

Selective absorption

d)

Scattering

44.

An object is dropped from a cliff. How far does the object fall in three seconds? Assume g=10 ms−2ms^{-2}  

a)

60 m

b)

25 m

c)

30 m

d)

45 m

45.

Which option shows correctly whether a moment of a force , and momentum, are scalar or vector quantities?

a)

moment of a force-scalar, momentum-scalar

b)

moment of a force-scalar, momentum-vector

c)

moment of a force-vector, momentum-scalar

d)

moment of a force-vector, momentum-vector

46.

Two forces of 3N and 4N are acting on an object at right angles. What would the resultant force be, in N?

a)

12

b)

1

c)

7

d)

5

47.

A car of mass 1000 kg accelerates on a straight, flat, horizontal road with an acceleration

a = 0.3 m s–2.

The driving force F on the car is opposed by a resistive force of 500 N. Calculate the resultant force acting on the car.

a)

200 N

b)

300 N

c)

500 N

d)

800 N

48.

which has the highest current flowing through it?

a)

R1

b)

R2

c)

R3

d)

All the same

49.

Which copper wire has the lowest resistance?

a)

R1

b)

R2

c)

R3

d)

R2 and R3

50.

The length of a certain conductor of resistance 100 Ω is doubled and its cross-sectional area is halved. Its new resistance is

a)

100 Ω

b)

50 Ω

c)

200 Ω

d)

400 Ω

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