## Class/Course - Medical Entrance

### Subject - Physics

#### Total Number of Question/s - 3470

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• 1. Physical World and Measurement - Quiz

1. If x = at + bt2, where x is the distance travelled by the body in kilometer while t is the time in second, then unit of b is
a) km/s
b) km-s
c) Km/s2
d) km/s2

2. The percentage errors in the measurements of mass and speed are 2% and 3% respectively. The error in kinetic energy obtained by measuring mass and speed, will be
a) 12%
b) 10%
c) 8%
d) 2%

• 2. Motion in One Dimension - Quiz

1. A car moving with a speed of 40km/h can be stopped after 2m by applying brakes. If the same car is moving with a speed of 80 km/h, what is the minimum stopping distances of
a) 8m
b) 2m
c) 4m
d) 6m

2. If a ball is thrown vertically upwards with speed u, the distance cobered during the last t seconds of its ascent is
a) $ut - \frac{1}{2}gt^{2}$
b) (u+gt)t
c) ut
d) $\frac{1}{2}gt^{2}$

• 3. Motion in Two and Three Dimension - Quiz

1. The speed of a boat is 5km/h in still water. It crosses a river of width 1.0 km along the shortest possible path in 15 min. The velocity of the river water is (km/h)
a) 5
b) 1
c) 3
d) 4

2. A person swim in a river aiming to reach exactly opposite point on the bank of the river. His spped of swimming is 0.5m/s at an angle 1200 with the direction of flow of water. The speed of water in stream is
a) 1.0 m/s
b) 0.5 m/s
c) 0.25 m/s
d) 0.43 m/s

• 4. Laws of Motion - Quiz

1. A block of mass 10 kg is placed on arough horizontal surface having coefficient of friction μ = 0.5. If a horizontal force of 100N is applied on it, then the acceleration of the block will be (g = 10 m/s2)
a) 15 m/s2
b) 10 m/s2
c) 5 m/s2
d) 0.5 m/s2

2. A ball of mass 150g moving with an acceleration 20 m/s2 is hit by a force, which acts on it for 0.1 s. The impulsive force is
a) 0.5 N
b) 0.1 N
c) 0.3 N
d) 1.2 N

• 5. Work, Energy and Power - Quiz

1. A body mass 1 kg is thrown upwards with a velocity 20ms-1. It momentarily comes at rest after attaining a height of 18m. How much energy is lost due to air friction ? (g = 10 ms-2)
a) 20 J
b) 30 J
c) 40 J
d) 10 J

2. A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities v1 and v2. The ratio of their kinetic energies E1/E2 is
a) 1
b) $\frac{m_{1}v_{2}}{m_{2}v_{1}}$
c) $\frac{m_{2}}{m_{1}}$
d) $\frac{m_{1}}{m_{2}}$

• 6. Rotational Motion - Quiz

1. A solid sphere of radius R is placed on a smooth horizontal surface force F is applied at height h from the lowest point. For the maximum acceleration of the centre of mass
a) h = R
b) h = 2R
c) h = 0
d) the acceleration will be same whatever h may be

2. The angular momentum of a body with mass (m) moment of inertia (I) and angular velocity (ω)rad/s is equal to
a) Iω
b) Iω2
c) $\frac{I}{\omega}$
d) $\frac{I}{\omega^{2}}$

• 7. Gravitation - Quiz

1. The escape velocity of a body on the surface of the earth is 11.2 km/s . If the earths mass increases to twice its present value and the radius of the earth becomes half, the escape velocity would become
a) 44.8 km/s
b) 22.4 km/s
c) 11.2 km/s (remains unchanged)
d) 5.6 km/s

2. A planet is moving in an elliptical orbit around the sun. If T, U,E and L stand for its kinetic energy, gravitational potential energy, total energy and magnitude of angular momentum about the centre of force, which of the following is correct?
a) T is conserved
b) U is always positive
c) E is always negative
d) L is conserved but direction of vector L changes continuously

• 8. Heat and Thermodynamics - Quiz

1. One mole of an ideal gas requires 207J heat to rise the temperature by 10K when heated at constant volume to raise the temperature by the same 10K, the heat required is (Given the gas constant R = 8.3J/mol-K)
a) 198.7J
b) 29J
c) 215.3J
d) 124J

2. An ideal gas heat engine operates in a Carnot cycle between 2270C and 1270C. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to
a) 1.6
b) 1.2
c) 4.8
d) 3.5

• 9. Oscillations - Quiz

1. The potential energy of a long spring when stretched by 2cm is U. If the spring is stretched by 2cm is U. If the spring is stretched by 8 cm the potential energy stored in it is
a) 4U
b) 8U
c) 16U
d) U/4

2. A pendulum is displaced to an angle θ from its equilibrium position, then it will pass through its mean position with a velocity v equal to
a) $\sqrt{2gl}$
b) $\sqrt{2gl \ sin \theta}$
c) $\sqrt{2gl \ cos \theta}$
d) $\sqrt{2gl \left (1 - cos \theta \right )}$

• 10. Waves - Quiz

1. A wave of frequency 100Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speed of incident (and reflected) wave are
a) 5 m/s
b) 10 m/s
c) 20 m/s
d) 40 m/s

2. A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be
a) $\frac{v}{\sqrt{3}}$
b) $\frac{v}{3}$
c) $\frac{v}{4}$
d) $\frac{v}{2}$

• 11. Electrostatics - Quiz

1. Charges +q and -q are placed at points A and B respectively which are a distance 2L apart, C is the midpoiunt between A and B. The work done in moving a charge +Q along the semicircle CRD is

a) $\frac{qQ}{4\pi\varepsilon _{0}L}$
b) $\frac{qQ}{2\pi\varepsilon _{0}L}$
c) $\frac{qQ}{6\pi\varepsilon _{0}L}$
d) $-\frac{qQ}{4\pi\varepsilon _{0}L}$

2. Two spherical conductors A and B radii 1 mm and 2mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equlibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B of
a) 4:1
b) 1:2
c) 2:1
d) 1:4

• 12. Current Electricity - Quiz

1. A student measures the terminal potential difference (V) of a cell ( of emf ε and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept of the graph between V and I, then respectively, equal
a) ε and -r
b) -r and ε
c) r and -ε
d) -ε and r

2. If the resistance of a conductor is 5Ω at 500C and 7Ω at 1000C, then the mean temperature coefficient of resistance (of the material) is
a) 0.01/0C
b) 0.04/0C
c) 0.06/0C
d) 0.08/0C

• 13. Thermal and Chemical Effects of Current - Quiz

1. An electric kettle has two heating coil. When one of the coils is connected to an AC source, the water in the kettle boils in 10min. When the other coil is used the water boils in 40 min . If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
a) 25 min
b) 15 min
c) 8 min
d) 4 min

2. Three equal resistors connected in series across a source of emf together dissipate 10W of power. What will be the power dissipated in watt if the same resistors are connected in parallel across the same source of emf?
a) $\frac{10}{3}$
b) 10
c) 30
d) 90

• 14. Magnetic Effects of Current - Quiz

1. Current is flowing in a coil of area A and number of turns N, magnetic moment of the coil, M is equal to
a) NiA
b) $\frac{Ni}{A}$
c) $\frac{Ni}{\sqrt{A}}$
d) N2Ai

2. A positively charged moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
a) continue to move due east
b) move in a circular orbit with its speed unchanged
c) move in a circular orbit with its speed
d) gets deflected vertically upwards

• 15. Magnestism - Quiz

1. A bar magnet is oscillating in earths magnetic field with a period T. What happened to its period of motion , if its mass is quadrupled?
a) Motion remains simple harmonic with new period = $\frac{T}{2}$
b) Motion remains simple harmonic withh new period = eT
c) Motion remains simple harmonic with new period = 4T
d) Motions remains simple harmonic and the period stays nearly constant

2. The work done in turning a magnet of magnetic moment. M by an abgle of 900 from the meridian, is n times the corresponding work done to turn it through an angle of 600. The value of n is given by
a) 2
b) 1
c) 0.5
d) 0.25

• 16. Electromagnetic Induction - Quiz

1. A varying current in a coil change from 10 A to zero in 0.5 s. If the average emf induced in the coil is 220 V, the self-inductance of the coil is
a) 5H
b) 6H
c) 11H
d) 12H

2. If N is the number of turns in a coil, the value of self-inductance varies as
a) N0
b) N
c) N2
d) N-2

• 17. AC and Electromagnetic Waves - Quiz

1. The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux Φ linked with the primary coil is given by Φ = Φ0 + 4t, where Φ is in weber, t is time in second and Φ0 Is a constant, the output voltage across the secondary coil is
a) 90 V
b) 120 V
c) 230 V
d) 30 V

2. In a circuit , L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 450 . The value of C is
a) $\frac{1}{2\pi f\left (2\pi fL + R \right )}$
b) $\frac{1}{\pi f\left (2\pi fL + R \right )}$
c) $\frac{1}{2\pi f\left (2\pi fL - R \right )}$
d) $\frac{1}{\pi f\left (2\pi fL + R \right )}$

• 18. Ray Optics and Optical Instruments - Quiz

1. Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 m from eye? [The wavelength of light is 5000 Å ?
a) 2.32 m
b) 4.28 mm
c) 1.25 cm
d) 12.48 cm

2. A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the Sun is 1.39 x 109 m and its mean distance from the earth earth is 1.5 x 1011 m . What is the diameter of the Suns image on the paper?
a) 9.2 x 10-4 m
b) 6.5 x 10-4 m
c) 6.5 x 10-4 m
d) 12.4 x 10-4 m

• 19. Electrons and Photons - Quiz

1. A electron of mass m and charge e is accelerated from rest through a potential difference of V volt in vaccum . Its final speed will be
a) $\frac{eV}{2m}$
b) $\frac{eV}{m}$
c) $\sqrt{\frac{2eV}{m}}$
d) $\sqrt{\frac{eV}{2m}}$

2. Which of the following is not the property of cathode rays?
a) It produces heating effect
b) It does not deflect in electric field
d) It produces fluorescence

• 20. Atomic Physics - Quiz

1. The Bohr model of atoms
a) assumes that the angular momentum of electrons is quantized
b) Uses Einstein's photoelectric equation
c) predicts continuous emission species for atoms
d) predicts the same emission spctra for all types of atoms

2. The energy of ground electronic state of hydrogen atom is -13.6 eV. The energy of the first excited state will be
a) -54.4 eV
b) -27.2eV
c) -6.8 eV
d) -3.4 eV

• 21. Nuclear Physics - Quiz

1. A free neutron decays into a proton, an electron and
a) a beta particle
b) an alpha particle
c) an antineutrino
d) a neutrino

2. mp denote the mass of a proton and mn that of a neutron. A given nucleus of binding energy BE, containins Z protons and N neutrons. The mass m(N,Z) of the nucleus is given by
a) m(N,Z) = Nmn - ZMp - BEc2
b) m(N,Z) = Nmn + Zmp + BEc2
c) m(N,Z) = Nmn + Zmp - BE/c2
d) m(N,Z) = Nmn + Zmp + BE/c2

• 22. Solid and Semiconductors Devices - Quiz

1. The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is 10V. The DC component of the output voltage is
a) $\frac{10}{sqrt{2}}V$
b) $\frac{10}{\pi}V$
c) 10V
d) $\frac{20}{\pi}V$

2. In semiconductors at a room temperature
a) the valence band is partially empty and the condition band is partially filled
b) the valence band is completely filled and the conduction band is partially
c) the valence band is completely filled
d) the conduction band is completely empty