## Class/Course - Engineering Entrance

### Subject - Physics

#### Total Number of Question/s - 3094

Just Exam provide question bank for Engineering Entrance standard. Currently number of question's are 3094. We provide this data in all format (word, excel, pdf, sql, latex form with images) to institutes for conducting online test/ examinations. Here we are providing some demo contents. Interested person may contact us at info@justexam.in

• 1. Measurements - Quiz

1. Out of the following pairs, which one does not have identical dimensions?
a) Angular momentum and Planck constant
b) Impulse and momentum
c) Moment of inertia and moment of a force
d) Work and torque

2. The rad is the correct unit used to report the measurement of
a) The ability of a beam of gamma ray photons to produce ions in a target
b) The energy delivered by radiation to a target
c) The biological effect of radiation
d) The rate of decay of a radioactive source

• 2. Kinematics - Quiz

1. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes in a plane, it follows that
a) Its velocity is constant
b) Its acceleration is constant
c) Its kinetic energy is constant
d) It moves in a straight line

2. If $\vec{A} \times \vec{B}$ = $\vec{B} \times \vec{A}$, then the angle between A and B is
a) π
b) π/3
c) π/2
d) π/4

• 3. Laws of Motion - Quiz

1. A light string passing over a smooth light pulley connects two blocks of masses m1 and m2 (vertically). If the acceleration of the system is g/8, then the ratio of the masses is
a) 8 : 1
b) 9 : 7
c) 4 : 3
d) 5 : 3

2. A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing on the ground are respectively
a) g, g
b) g -a, g-a
c) g-a, g
d) a, g

• 4. Work, Energy and Power - Quiz

1. A bomb of mass 16 kg at rest explodes into two pieces of masses 4 kg and 12 kg. The velocity of the 12 kg mass is 4 ms-1/ The kinetic energy of the other mass is
a) 144 J
b) 288 J
c) 192 J
d) 96 J

2. A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further it will penetrate before coming to rest, assuming that it faces constant resistance to motion?
a) 3.0 cm
b) 2.0 cm
c) 1.5 cm
d) 1.0 cm

• 5. Rotational Motion - Quiz

1. Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is
a) v
b) $\frac{v}{3}$
c) $\frac{v}{2}$
d) zero

2. A pulley of radius 2 m is rotated about its axis by a force F = (20 t = 5t2)N ( where t is measured in seconds) applied tangentially. It the moment of intertia of the pulley about its axis of rotation is 10 kg-m2 the number of rotations made by the pulley before its direction of motion if reserved, is
a) More than 3 but less than 6
b) More than 6 but less than 9
c) More than 9
d) Less than 3

• 6. Gravitation - Quiz

1. If suddenly the gravitational force of attraction between earth and a satellite revolving around it becomes zero, then the satellite will
a) Continue to move in its orbit with same velocity
b) Move tangentially to the original orbit with the same velocity
c) Become stationary in its orbit
d) Move towards the earth

2. The change in the value of g at a height h above the surface of the earth is the same as at a depth d below the surface of earth. When both d and h are much smaller than the radius of earth, then which one of the following is correct?
a) d = $\frac{h}{2}$
b) d = $\frac{3h}{2}$
c) d = 2h
d) d = h

• 7. Properties of Solids and Liquids - Quiz

1. If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should
a) Increases
b) Remain unchanged
c) Decrease
d) First increases then decreases

2. Two spheres of the same material have radii 1 m and 4 m and temperature 4000 K ad 2000 K respectively . The ration of the energy radiated per second by the first sphere to that by the second is
a) 1 : 1
b) 16 : 1
c) 4 : 1
d) 1 : 9

• 8. Thermodynamics - Quiz

1. Heat cannot be itself flow from a body at lower temperature to a body a higher temperature is a statement or consequence of
a) Second law of thermodynamics
b) Conservation of momentum
c) Conservation of mass
d) First law of thermodynamics

2. Which statement is incorrect?
a) All reversible cycles have same efficiency.
b) Reversible cycle has more efficiency than an irreversible one.
c) Carnot cycle is a reversible one.
d) Carnot cycle has the maximum efficiency in all cycles.

• 9. Kinetic Theory of Gases - Quiz

1. If Cp and Cv denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then
a) Cp - CV = $\frac{R}{28}$
b) Cp - CV = $\frac{R}{14}$
c) Cp - CV = R
d) Cp - CV = 28R

2. A gaseous mixture consists of 16g of helium and 16g of oxygen . The ratio $\frac{C_{p}}{C_{V}}$ of the mixture
a) 1.59
b) 1.62
c) 1.4
d) 1.54

• 10. Oscillations and Waves - Quiz

1. A sound absorber attenuates the sound level by 20 db. The intensity decreases by a factor of
a) 1000
b) 10000
c) 10
d) 100

2. Two simple hgarmonic motions are represented by the equation y1 = 0.1 sin$(100\pi+ \frac{\pi}{3})$ and y2= 0.1 cos $\pi$t. The phase differnce of the velocity of particle 1, with respect to the velocity of particle 2 is
a) $\frac{-\pi}{6}$
b) $\frac{\pi}{3}$
c) $\frac{-\pi}{3}$
d) $\frac{\pi}{6}$

• 11. Electrostatics - Quiz

1. On moving a charge of 20 C by 2 cm, 2J of work is done, then the potential difference between the points is
a) 0.1 V
b) 8V
c) 2V
d) 0.5V

2. Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium , the value of q is
a) $-\frac{q}{4}\left (1 + 2\sqrt{2} \right )$
b) $\frac{q}{4}\left (1 + 2\sqrt{2} \right )$
c) $-\frac{q}{2}\left (1 + 2\sqrt{2} \right )$
d) $\frac{q}{2}\left (1 + 2\sqrt{2} \right )$

• 12. Current Electricity - Quiz

1. In a potentiometer experiment the balancing with a cell is at length 240cm. On shunting the cell with a resistance of 2Ω, the balancing length becomes 120cm. The internal resistance of the cell is
a) 1 Ω
b) 0.5Ω
c) 4Ω
d) 2Ω

2. A thermocouple is made from two metals, Antimony and bismuth. If one junction of the couple is kept hot and the other is kept cold, then an electric current will
a) flow from Antimony to Bismuth at the hot junction
b) flow from Bismuth to Antimony at the cold junction
c) not flow through the thermocouple
d) flow from Antimony to Bismuth at the cold junction

• 13. Magnetic Effects of Current and Magnetism - Quiz

1. Two identical conducting wires AOB and COD are placed at right angle to each other. The wire AOB carries an electric current I1 and COD carries a current I2. The magnetic field on a point lying at a distance d from O, in a direction perpendicular to the plane of the wires AOB and COD, will be given by
a) $\frac{\mu_{0}}{2\pi}\left (\frac{I_{1} + T_{2}}{d} \right )^{1/2}$
b) $\frac{\mu_{0}}{2\pi d}\left (I_{1}^{2} + I_{2}^{2} \right )^{1/2}$
c) $\frac{\mu_{0}}{2\pi d}\left (I_{1} + I_{2} \right )$
d) $\frac{\mu_{0}}{2\pi d}\left (I_{1}^{2} + I_{2}^{2} \right )$

2. The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54μT. What will will be its value at the centre of the loop?
a) 250μT
b) 150μT
c) 125μT
d) 75μT

• 14. Electromagnetic Induction and Alternating Current - Quiz

1. In a series L-C-R circuit R = 200Ω and the voltage and the frequency of the main supply is 220V and 50Hz respectively. On taking out the capacitance from the circuit lags behind the voltage by 300. The power dissipated in the L-C-R circuit is
a) 305W
b) 210 W
c) zero
d) 242 W

2. In an AC generator, a coil with N turns, all of all same area A and total total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of emf generated in the coil is
a) N A B R ω
b) N A B
c) N A B R
d) N A B ω

• 15. Electromagnetic Waves - Quiz

1. Which of the following radiations has the least wavelength?
a) γ-rays
b) β-rays
c) α-rays
d) X-rays

2. The rms value of the electric field of the light coming from the sum is 720 NC-1. The average total energy density of the electromagnetic wave is
a) 4.58 x 10-6 Jm-3
b) 6.37 x 10-19 Jm-3
c) 81.35 x 10-12 Jm-3
d) 3.3 x 10-3 Jm-3

• 16. Optics - Quiz

1. In a Youngs double slit experiment , the slits act as coherrent sources of waves of equal amplitude A and wavelength λ. In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength . If the intensity at the middle point the screen in the first case is I1 and in the second case I2, then the ratio $\frac{I_{1}}{I_{2}}$ is
a) 4
b) 2
c) 1
d) 0.5

2. To get three images of a single object, one should have two plane mirrors at an angle of
a) 600
b) 900
c) 1200
d) 300

• 17. Dual Nature of Matter and Radiation - Quiz

1. A photocell is illuminated by a small bright source placed 1 m away . When the same source of light is placed $\frac{1}{2}$ away, the number of electrons emitted by photocathode would
a) decrease by a factor of 4
b) increase by a factor of 4
c) decrease by a factor of 2
d) increase by a factor of 2

2. If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the face
a) $\frac{1}{2}$
b) 2
c) $\frac{1}{\sqrt{2}}$
d) $\sqrt{2}$

• 18. Atoms and Nuclei - Quiz

1. The part of a transistor which is most heavily doped to produce large number of majority carriers is
a) emitter
b) base
c) collector
d) can be any of the above three

2. If N0 is the original mass of the substance of half-life period t1/2 = 5 yr. then the amount of substance left after 15 yr, is
a) $\frac{n_{0}}{8}$
b) $\frac{n_{0}}{16}$
c) $\frac{n_{0}}{2}$
d) $\frac{n_{0}}{4}$

• 19. Electronic Devices - Quiz

1. In the adjacent circuits, A and B represent two inputs and C represents the output,

The circuits represents
a) NOR gate
b) AND gate
c) NAND gate
d) OR gate

2. A piece of copper and another of germanium are cooled from room temperature to 77K, the resistance of
a) each of them increases
b) each of them decreases
c) copper decreases and germanium increases
d) copper increases and germanium decreases

• 20. Communication Systems - Quiz

1. Consider telecommunication through optical fibres. Which of the following statements is not true?
a) Optical fibres can be graded refractive index
b) Optical fibres are subjected to electromagnetic interference from outside
c) Optical fibres have extremely low transmission loss
d) Optical fibres may have homogeneous core with a suitable cladding

2. This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement 1. Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals.
Statement 2 The state of ionosphere varies from hour to hour, day to day and season to season.
a) Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of Statement 1
b) Statement 1 is true , Statement 2 is true, Statement 2 is not the correct explanations of Statement 1
c) Statement 1 is false, Statement 2 is true
d) Statement 1 is true, Statement 2 is false