## Class/Course - Engineering Entrance

### Subject - Physics

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

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• 1. Measurements - Quiz

1. 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. Which of the following units denotes the dimensions [ML2/Q2], where Q denotes the electric charge?
a) Wb/m2
b) Henry (H)
c) H/m2
d) Weber (Wb)

• 2. Kinematics - Quiz

1. A water fountain on the sprinkles water all around it. If the speed of water coming out of the fountain is v, the total area around the fountain that gets wet is
a) $\pi\frac{v^{4}}{g^{2}}$
b) $\frac{\pi}{2}\frac{v^{4}}{g^{2}}$
c) $\pi\frac{v^{2}}{g^{2}}$
d) $\pi\frac{v^{2}}{g}$

2. The coordinates of a moving particle at any time t are given by x = αt3 and y = βt3. The speed of the particle at time t given by
a) $3t\sqrt{\alpha^{2} + \beta^{2}}$
b) $3t^{2}\sqrt{\alpha^{2} + \beta^{2}}$
c) $t^{2}\sqrt{\alpha^{2} + \beta^{2}}$
d) $\sqrt{\alpha^{2} + \beta^{2}}$

• 3. Laws of Motion - Quiz

1. One end of massless rope, which passes over a massless and frictionless pulley P is tied to a hook C while the other end is free. Maximum tension that the rope can bear is 360 N. With what value of maximum safe acceleration (in ms-2) can a man of 60 kg climb on the rope? a) 16
b) 6
c) 4
d) 80

2. A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is a) 20 N
b) 50 N
c) 100 N
d) 2 N

• 4. Work, Energy and Power - Quiz

1. A force $\vec{F}=\left ( 5\hat{i} + 3\hat{j} + 2\hat{k}\right )$N0 is applied over a particle which displaces it from its origin to the point $\vec{r}=\left ( 2\hat{i} - \hat{j}\right )$m. The work done on the particle in joules is
a) -7
b) 7
c) 10
d) 13

2. Statement I Two particles moving in the same direction do not lose all their energy in a completely inelastic collision.
Statement II Principle of conservation of momentum holds true for all kinds of collisions.
a) Statement I is true, Statement II is true; Statement II is the correct explanation of Statement I.
b) Statement I is true, Statement II is true; Statement II is not the correct explanation of Statement I.
c) Statement I is false, Statement II is true.
d) Statement I is the true, Statement II is false.

• 5. Rotational Motion - Quiz

1. A T shaped object with dimensions shown in the figure, is lying on a smooth floor. A force $\vec{F}$ is applied at the point P parallel to AB, such that the object has only the translational motion without rotation. Find the location of P with respect to C. a) $\frac{2}{3}l$
b) $\frac{3}{2}l$
c) $\frac{4}{3}l$
d) l

2. A round uniform body of radius R, mass M and moment of interia I, rolls down ( without slipping) an inclined plane making an angle θ with the horizontal. Then its acceleration is
a) $\frac{g sin\theta}{1 + I/MR^{2}}$
b) $\frac{g sin\theta}{1 + MR^{2}/I}$
c) $\frac{R sin\theta}{1 - I/MR^{2}}$
d) $\frac{g sin\theta}{1 - MR^{2}/I}$

• 6. Gravitation - Quiz

1. The escape velocity of a body depends upon mass as
a) m0
b) m1
c) m2
d) m3

2. The time period of an earth satellite in circular orbit is independent of
a) The mass of the satellite
c) Both the mass and radius of the orbit
d) Neither the mass of the satellite nor the radius of its orbit

• 7. Properties of Solids and Liquids - Quiz

1. 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

2. Infrared radiations are detected by
a) Spectrometer
b) Pyrometer
c) Nanometer
d) Photometer

• 8. Thermodynamics - Quiz

1. Which of the following statements is correct for any thermodynamics system?
a) The internal energy changes in all processes.
b) Internal energy and entropy are state functions.
c) The change in entropy can never be zero .
d) The work done in an adiabatic process is always zero.

2. The net work on the gas in the cycle ABCDA is
a) Zero
b) 276 R
c) 1076 R
d) 1904 R

• 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. Three perfect gases at absolute temperatures T1, T2 and T3 are mixed. The masses of molecules are m1, m2 and m3 and the number of molecules are n1, n2 and n3 respectively . Assuming no loss of energy, the final temperature of the mixture is
a) $\frac{n_{1}T_{1} + n_{2}T_{2} + n_{3}T_{3}}{n_{1}+ n_{2} + n_{3}}$
b) $\frac{n_{1}T_{1}^{2} + n_{2}T_{2}^{2} + n_{3}T_{3}^{2}}{n_{1}T_{1}+ n_{2}T_{2} + n_{3}T_{3}}$
c) $\frac{n_{1}^{2}T_{1}^{2} + n_{2}^{2}T_{2}^{2} + n_{3}^{2}T_{3}^{2}}{n_{1}T_{1}+ n_{2}T_{2} + n_{3}T_{3}}$
d) $\frac{\left ( T_{1} + T_{2} + T_{3} \right )}{3}$

• 10. Oscillations and Waves - Quiz

1. If a spring of stiffness k is cut into parts A and B of length lA : lB = 2:3 , then the stifness of spring A is given by
a) $\frac{5}{2}k$
b) $\frac{3k}{5}$
c) $\frac{2k}{5}$
d) k

2. Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave product on it, is
a) 20
b) 80
c) 40
d) 120

• 11. Electrostatics - Quiz

1. The work done in placing a charge of 8 x 10-18C on a condenser of capacity 100μF is
a) 16 x 10-32J
b) 3.1 x 10-26J
c) 4 x 10-32J
d) 32 x 10-32 J

2. A parallel plate capacitor with air between the plates has a capacitance of 9pF. The separation between its plates is d. The space between the plate is now filled with two dielectrics. One the plate is now dielectric constant K1 = 3 and thickness $\frac{d}{3}$ while the other one has dielectric constant K2 = 6 and thickness $\frac{2d}{3}$. Capacitance of the capacitor is now
a) 1.8 pF
b) 45 pF
c) 40.5 pF
d) 20.25 pF

• 12. Current Electricity - Quiz

1. A 220V, 1000W bulb is connected across a 110V mains supply. The power consumed will be
a) 750 W
b) 500 W
c) 250 W
d) 1000W

2. Time taken by a 836W heater to heat one litre of water from 100C to 400C is
a) 50 s
b) 100 s
c) 150 s
d) 200 s

• 13. Magnetic Effects of Current and Magnetism - Quiz

1. Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3A and 4A are the currents flowing in each coil respectively. The magnetic induction in Wb/m2 at the centre of the coils will be
0 = 4π x 10-7 Wb/Am)
a) 12 x 10-5
b) 10-5
c) 5 x 10-5
d) 7 x 10-5

2. A magnetic needle lying parallel to a magnetic field requires W unit of work to turn it through 600. The torque needed to maximum the needle in this position will be
a) $\sqrt{3}W$
b) W
c) $\left (\frac{\sqrt{3}}{2} \right )W$
d) 2W

• 14. Electromagnetic Induction and Alternating Current - Quiz

1. In an LCR circuit series AC circuit, the voltage across each of the components L, C and R is 50V. The voltage across the LC combination will be
a) 50V
b) $50\sqrt{2}V$
c) 100 V
d) zero

2. The flux linked with a coil at any instant t is given by
φ = 10t2 - 50t + 250
The induced emf at t = 3s is
a) -190V
b) -10V
c) 10V
d) 190V

• 15. Electromagnetic Waves - Quiz

1. A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is
a) $\frac{E}{c}$
b) $\frac{2E}{c}$
c) Ec
d) $\frac{E}{c^{2}}$

2. An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium and permittivity ε = 4.0. Then
a) wavelength is doubled and the frequency remains unchanged
b) wavelength is doubled and frequency becomes half
c) wavelength is halved and frequency remains unchanged
d) wavelength and frequency both remain unchanged

• 16. Optics - Quiz

1. In a Youngs double slit experiment the intension at a point where the path difference is $\frac{\lambda}{6}$ (λ being the wavelength of the light used) is I. If I0 denotes the maximum intensity ,$\frac{I}{I_{0}}$ is equal to
a) $\frac{1}{\sqrt{2}}$
b) $\frac{\sqrt{3}}{2}$
c) $\frac{1}{2}$
d) $\frac{3}{4}$

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. The surface a metal is islluminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV-nm)
a) 3.09 eV
b) 1.42 eV
c) 151 eV
d) 1.68 eV

2. Wave property of electrons implies that they will slow diffraction effects. Davisson and Germer demonstrated this by diffracting effects .Davisson and Germer demonstrated this by diffracting electrons from crystal. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere construtively (see figure) In an experiment, electrons are made to pass through a narrow slit of width d comparable to their de-Broglie wavelength. They are detected on a screen at a distance D from the slit(see figure) which of the following graphs can be expected to represent the number of electrons N detected as a function of the detector position y(y = 0 corresponds to the middle of the slit)?
a) b) c) d) • 18. Atoms and Nuclei - Quiz

1. Which of the following cannot be emitted by radioactive substances during their decay?
a) Protons
b) Neutrons
c) Helium nuclei
d) Electrons

2. Which of the following atoms has the lowest ionization potential?
a) $^{14}_{7}N$
b) $^{133}_{55}Cs$
c) $^{40}_{18}Ar$
d) $^{16}_{8}O$

• 19. Electronic Devices - Quiz

1. In a common-base mode of a transistor , the collector is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplication factor (beta;) will be
a) 49
b) 50
c) 51
d) 48

2. The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit? a) 1.71 A
b) 2.00 A
c) 2.31 A
d) 1.33 A

• 20. Communication Systems - Quiz

1. The logic circuit shown below has the input waveforms A and B as shown. Pick out the correct output wavefrom.  a) b) c) d) 2. Which of the following four alternatives is not correct?
a) to increase the sensitivity
b) to reduce the time lag between transmission and reception of the information signal
c) to reduce the size of antenna
d) to reduce the fractional band width, that is the ratio of the signal band width to the centre frequency