Free Printable Physics FLP

1.

The power loss P in a resistor is calculated using the formula P = V ² / R . The uncertainty in the potential difference V is 3% and the uncertainty in the resistance R is 2%. What is the maximum uncertainty in P?

a)

4%

b)

8%

c)

7%

d)

11%

2.

A bullet is fired from a cannon with velocity 500 m/s. If the angle of projection is 15° and g = 10 m/s², then the range is:

a)

25×10³m

b)

50×10²m

c)

12.5×10³m

d)

25×10²m

3.

The average power and instantaneous power become equal if work is done at

a)

Any rate

b)

Uniform rate

c)

Variable rate

d)

High rate

4.

Flight of a rocket in the space is an example of

a)

Second law of motion

b)

Second law of motion

c)

Third law of motion

d)

Law of gravitation

5.

Two men with weights in the ratio 5 : 3 run up a staircase (of same height) in times in the ratio 11 : 9. The ratio of power of first to that of second is

a)

11/15

b)

15/11

c)

11/9

d)

9/11

6.

A ball of mass 0.25 kg attached to the end of a string of length 1.96 m is moving in a horizontal circle. The string will break if the tension is more than 25 N. What is the maximum speed with which the ball can be moved?

a)

14 m/s

b)

3.92 m/s

c)

3 m/s

d)

5 m/s

7.

A wheel is at rest. Its angular velocity increases uniformly and becomes 60 rad/sec after 5 sec. The total angular displacement is

a)

600 rad

b)

75 rad

c)

300 rad

d)

150 rad

8.

Two stretched strings have lengths ℓ and 2ℓ while tensions are T and 4T respectively. If they are made of same material the ratio of their frequencies is

a)

1:1

b)

2:1

c)

1:2

d)

1:4

9.

A stationary wave is set up in the air column of a closed pipe. At the closed end of the pipe

a)

Always a node is formed

b)

Neither node nor antinode is formed

c)

Always an antinode is formed

d)

Sometimes a node and sometimes an antinode is formed

10.

Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joule of work

a)

8200 J

b)

5600 J

c)

7900 J

d)

6400 J

11.

The radius of two metallic spheres A and B are r₁ and r₂ respectively (r₁>r₂). They are connected by a thin wire and the system is given a certain charge. The charge will be greater

a)

On the surface of the sphere A

b)

Equal on both

c)

On the surface of the sphere B

d)

Zero on both

12.

The diagrams below show regions of equal potentials.

If a positive charge is moved from A to B in each diagram then

a)

Maximum work is required to move q in figure [b].

b)

In all the four cases the work done is the same

c)

Maximum work is required to move q in figure [c].

d)

Minimum work is required to move q in figure [a]

13.

If two wires made of same material have lengths in ratio 1 : 2 and the areas in ratio 2 : 3, then the resistances are in ratio

a)

4:9

b)

8:9

c)

3:4

d)

4:3

14.

A current flow in two resistors connected in series which of the following describes ammeter and voltmeter readings

a)

A₁=A₂, V₁>V₂

b)

A₁=A₂, V₂>V₁

c)

A₁>A₂, V₁=V₂

d)

A₁<A₂, V₁=V₂

15.

There will be no force experienced if

a)

Two parallel wires having current in same direction

b)

A positive charge projected perpendicular in magnetic field

c)

Two parallel wires having current in opposite direction

d)

A positive charge projected along axis of solenoid

16.

An electron of mass m is accelerated through a potential difference of V and then it enters a magnetic field of induction B normal to the lines. Then the radius of the circular path is

a)

$\sqrt[]{\frac{2eV}{m}}$

b)

$\sqrt[]{\frac{2Vm}{eB^2}}$

c)

$\sqrt[]{\frac{2Vm}{eB}}$

d)

$\sqrt[]{\frac{2Vm}{e^2B}}$

17.

Two long straight wires are set parallel to each other at separation r and each carries a current I in the same direction. The strength of the magnetic field at any point midway between the two wires is

a)

$\frac{\mu_oI}{r}$

b)

$\frac{2\mu_oI}{2r}$

c)

$\frac{2\mu_oI}{r}$

d)

Zero

18.

A transformer has 100 turns in primary coil and 200 turns in the secondary coil. If 200 V emf is induced in the secondary coil then the input emf is

a)

2000 V

b)

400 V

c)

400000 V

d)

100 V

19.

Which of given Law is according to Law of conservation of energy?

a)

Faraday’s Law

b)

Ampere’s Law

c)

Lenz’s Law

d)

Ohm’s Law

20.

A coil has 60 turns if magnetic flux linked with it changes at the rate 1 wb/min the induced emf established in the coil is

a)

60 V

b)

1 V

c)

$\frac{1}{60}V$

d)

0.5 V

21.

The resistance of an ideal diode in reverse bias condition is

a)

Infinite

b)

Zero

c)

Finite

d)

Negative

22.

In a half wave rectifier, the frequency of the input is N, the frequency and form of the output will be

a)

N/2 and Pulsating

b)

N and Pulsating

c)

2N and steady

d)

N and continuous

23.

In a photoelectric cell, illuminated with a certain radiation, the minimum negative anode potential with respect to emitting metal required to stop the electron is 2 V. The maximum kinetic energy of photoelectrons is

a)

0 eV

b)

2 eV

c)

1 eV

d)

4 eV

24.

Which one is correct expression of de Broglie equation for the wave length of atoms of mass m at temp? T(k= Boltzmann constant)

a)

$\lambda=\frac{h}{3mk}$

b)

$\frac{h}{\sqrt[]{3kTm}}$

c)

$\frac{h}{3kTm}$

d)

$\lambda=\frac{h}{\sqrt[]{3kT}}$

25.

The ratio of the kinetic energy and T.E of the electron in the hydrogen atom according to Bohr’s theory is

a)

1:-1

b)

1:2

c)

1:1

d)

1:-2

26.

The velocity of electrons revolving around hydrogen nucleus is directly proportional to (n = principle quantum number)

a)

n

b)

$\frac{1}{n}$

c)

n²

d)

$\frac{1}{n^2}$

27.

Charge on α-particles is _______.

a)

+1

b)

-2

c)

+2

d)

-1

28.

A particle moves in a circular path of radius r. In half the period of revolution, its displacement and distance covered are:

a)

$2r,\pi r$

b)

$2r,2\pi r$

c)

$r,\pi r$

d)

$r\sqrt[]{2},\pi r$

29.

Time rate of change of momentum is equal to

a)

Force

b)

Velocity

c)

Impulse

d)

Both A and C

30.

Newton’s laws do not hold good for particles, which

a)

Are at rest

b)

Move with high velocity

c)

Are moving slowly

d)

Move with velocity comparable to velocity of light

31.

Uniform constant retarding force is applied in order to stop a truck if its speed is doubled then the distance traveled by it will be.

a)

Four times

b)

Half

c)

Double

d)

Same

32.

Kinetic energy of a body of mass m and momentum P is given by:

a)

P²m

b)

mP

c)

$\frac{m^2}{2P}$

d)

$\frac{m^2}{2m}$

33.

In the presence of air friction, the relation for free falling body is

a)

$mgh=\frac{1}{2}mv^2-fh$

b)

$mgh=fh-\frac{1}{2}mv^2$

c)

$mgh=\frac{1}{2}mv^2+fh$

d)

$mgh=fh+\frac{1}{2}mv^2$

34.

A spherically-shaped satellite of mass m and radius r is moving around the earth in a circular orbit of radius r with constant speed v. Which of the following represents the force acting on the satellite as seen by an observer on the earth?

a)

b)

c)

d)

35.

A particle oscillating in simple harmonic motion is

a)

Never in equilibrium because there is always a force

b)

In equilibrium at the center of its path because the acceleration is zero there

c)

Never in equilibrium because it is in motion

d)

in equilibrium at the ends of its path because its velocity is zero there

36.

Potential energy of a mass spring system with respect to displacement for simple harmonic motions (SHM) is shown in the figure.

Which of the following represents the total energy of mass spring system during SHM?

a)

b)

c)

d)

37.

The graph shown below the variation of displacement with time for a particle moving with simple harmonic motion. Which one of the following correctly gives the value of the frequency and the amplitude of the motion?

a)

A

b)

B

c)

C

d)

D

38.

A sound source is moving towards stationary listener with $\frac{1}{10}th$ of the speed of

sound. The ratio of apparent to real frequency is

a)

$\left(\frac{9}{10}\right)^2$

b)

$\frac{11}{10}$

c)

$\frac{10}{9}$

d)

$\left(\frac{11}{10}\right)^2$

39.

Change in temperature of a body is 50°C. The change in temperature on Kelvin scale

a)

50K

b)

323K

c)

70K

d)

20K

40.

By inserting a plate of dielectric material between the plates of a parallel plate

capacitor, the energy is decreased three times. The dielectric constant of the material is

a)

$\frac{1}{25}$

b)

$\frac{1}{3}$

c)

3

d)

9

41.

Charge 2Q and –Q are placed as shown in figure. The point at which electric intensity is zero will be

a)

somewhere between –Q and +2Q

b)

somewhere on the left of –Q

c)

somewhere on the right of +2Q

d)

somewhere on the right bisector of line joining –Q and +2Q

42.

Three resistances of 4Ω each are connected as shown in figure. If the point D divides the resistance into two equal halves, the resistance between point A and D will be

a)

12Ω

b)

3Ω

c)

6Ω

d)

A) 13Ω

43.

A cylindrical copper rod is reformed to twice its original length with no change in volume. If the resistance between its ends was R before the change, it is now

a)

2R

b)

4R

c)

$\frac{R}{4}$

d)

8R

44.

A positively charged particle moving with velocity $\overrightarrow{v}$ enters a region of space having a constant magnetic induction B. The particle will experience the largest deflecting force when the angle between vector $\overrightarrow{v}$ and $\overrightarrow{B}$ is

a)

0^o

b)

45^o

c)

90^o

d)

180^o

45.

The diagram shows three long straight wires P,Q and R normal to the plane of paper, wires P and R carry current directed in to the plane of paper and wire Q carries current directed out of paper, all three currents at the same magnitude. Which arrow best shows the direction of resultant force on wire P?

a)

A

b)

B

c)

C

d)

D

46.

When current passes through a spring then the spring will

a)

Expand

b)

Remain same

c)

Compress

d)

None of these

47.

A coil having 500 square loops, each of side 10 cm, is placed normal to a magnetic field which increases at the rate of 1.0T/s . The induced emf in volts is

a)

0.1

b)

0.5

c)

1.0

d)

5.0

48.

If the core of transformer is of substance whose hysteresis loop area is decreased then the efficiency of transformer is

a)

increased

b)

same as original

c)

decreased

d)

none of these is possible

49.

Light of wavelength $\lambda$ falls on a metal having work function $hc/\lambda_o$ . Photoelectric effect will take place only if

a)

$\lambda\ge\lambda_o$

b)

$\lambda\ge2\lambda_o$

c)

$\lambda\le\lambda_o$

d)

$\lambda<\frac{\lambda_o}{2}$

50.

A pn junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The output current in the circuit is represented by:

a)

A

b)

B

c)

C

d)

D

51.

An atom makes a transition from a state of energy E₂ to one of lower energy E₁. Which of the following gives the wavelength of the radiation emitted, in terms of the Planck constant h and the speed of light c?

a)

$\frac{E_2-E_1}{hc}$

b)

$\frac{hc}{E_2}-\frac{hc}{E_1}$

c)

$\frac{hc}{E_2-E_1}$

d)

$\frac{c}{h\left(E_2-E_1\right)}$

52.

The value of wavelength of radiation emitted due to transition of electrons from n = 4 to n = 2 state in hydrogen atom will be

a)

$\frac{5R}{36}$

b)

$\frac{16}{3R}$

c)

$\frac{36}{5R}$

d)

$\frac{3R}{16}$

53.

In which sequence the radioactive radiations are emitted in the following nuclear reaction?

$X_z^A\longrightarrow Z_{z-1}^A\longrightarrow K_{z-1}^{A-4}\longrightarrow K_{z-1}^{A-4}$

a)

$\alpha,\beta\ and\ \gamma$

b)

$\beta,\alpha\ and\ \gamma$

c)

$\beta,\gamma\ and\ \beta$

d)

$\gamma,\alpha\ and\ \beta$

54.

After 2 hours $\left(\frac{1}{16}\right)$ th of the initial amount of a certain radioactive isotope remains an-decayed. The half-life of the isotopes is:

a)

60 minutes

b)

30 minutes

c)

45 minutes

d)

15 minutes

Physics FLP - 1

Total questions: 54

Worksheet time: 1hrs 20mins

Similar Resources on Wayground