## Class/Course - Medical Entrance

### Subject - Physics

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

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• 1. Physical World and Measurement - Quiz

1. Plancks constant has the dimensions of
a) linear momentum
b) angular momentum
c) energy
d) power

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. The displacement x of a particle varies with time t as x = ae-αt + beβt, a,b,α and β are positive constants. The velocity of the particle will
a) decrease with time
b) be independent of α and β
c) drop to zero when α = β
d) increase with time

2. A particle shows distance -time curves as given in this figure. The maximum instantaneous velocity of the particle is around the point a) B
b) C
c) D
d) A

• 3. Motion in Two and Three Dimension - Quiz

1. The maximum range of a gun of horizontal terrain is 16km. If g = 10 ms-2, then muzzle velocity of a shell must be
a) 160 ms-1
b) 200 √2 ms-1
c) 400 ms-1
d) 800 ms-1

2. A bus moving on a straight road towards north with a uniform speed of 50km/h. If the spped remains unchanged after turning through 900 , the increase in the velocity of bus in the turning process is
a) 70.7 km/h along south-west direction
b) zero
c) 50km/halong west
d) 70.7 km/h along north-west direction

• 4. Laws of Motion - Quiz

1. A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms-1 . To give an initial upward acceleration of 20 m/s2, the amount of gas ejected per second to supply the needed thrust will be (g = 10ms2)
a) 127.5 kg s-1
b) 187.5 kg s-1
c) 185.5 kg s-1
d) 137.5 kg s-1

2. A satellite in a force free space sweeps stationary interplanetary dust at a rate $\frac{dM}{dt} = av$. The acceleration of satellite is
a) $-\frac{2 \alpha v^{2}}{M}$
b) $-\frac{\alpha v^{2}}{M}$
c) $-\frac{\alpha v^{2}}{2M}$
d) -av2

• 5. Work, Energy and Power - Quiz

1. A body of mass m moving with velocity 3 km/h collides with a body of mass 2m at rest. Now the coalesced mass starts to move with a velocity
a) 1 km/h
b) 2 km/h
c) 3km/h
d) 4km/h

2. 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

• 6. Rotational Motion - Quiz

1. A flywheel rotating about a fixed axis has a kinetic energy of 360J when its angular speed is 30rad/s. The moment of inertia of the wheel about the axis of rotaion is
a) 0.6 kg-m2
b) 0.15 kg-m2
c) 0.8 kg-m2
d) 0.75 kg-M2

2. Three particles , each of mass m grams situated at the vertices of an equilateral triangle ABC of side l cm ( as shown in figure). The moment of inertia of the system about a line AX perpendicular to AB and in the plane of ABC in g-cm2 units will be a) $\left (\frac{3}{4} \right )ml^{2}$
b) 2 ml2
c) $\left (\frac{5}{4} \right )ml^{2}$
d) $\left (\frac{3}{2} \right )ml^{2}$

• 7. Gravitation - Quiz

1. A body of mass m is placed on earts surface . It is then taken from earths surface to a height h = 3R, then the change in gravitational potential energy is
a) $\frac{mgh}{R}$
b) $\frac{2}{3}mgR$
c) $\frac{3}{4}mgR$
d) $\frac{mgR}{2}$

2. The period of revolution of planet A rounf the sun is times that of B. The distance of A from the sun is how many times greater than that of B from the sun?
a) 5
b) 4
c) 3
d) 2

• 8. Heat and Thermodynamics - Quiz

1. First law of thermodynamics is a consequence of conservation of
a) work
b) energy
c) heat
d) All of these

2. The efficiency of a Carnot engine operating between temperatures of 1000C and -230C will be
a) $\frac{100 - 273}{273}$
b) $\frac{100 + 273}{373}$
c) $\frac{100 - 23}{100}$
d) $\frac{100 + 23}{100}$

• 9. Oscillations - Quiz

1. Two springs constants k1 and k2 are joined in series. The effective spring constant of the combination is given by
a) $\sqrt{k_{1}k_{2}}$
b) $\frac{\left (k_{1} + k_{2} \right )}{2}$
c) k1 + k2
d) $\frac{k_{1}k_{2}}{\left (k_{1} + k_{2} \right )}$

2. Two springs A and B have force constants KA and KB such that kB = 2kA . The four ends of the springs are stretched by the same force. If energy stored in spring A is E, then energy stored in spring B is
a) $\frac{E}{2}$
b) 2E
c) E
d) 4E

• 10. Waves - Quiz

1. Two sources are at a finite distance apart. They emit sounds of wavelength λ. An observer situated between them on line joining approaches one source with speed u. Then the number of beats heard/s by observer will be
a) $\frac{2u}{\lambda}$
b) $\frac{u}{\lambda}$
c) $\frac{u}{2\lambda}$
d) $\frac{u}{\lambda}$

2. The frequency of sinusoidal wave, 0.40 cos(2000t + 0.80) would be
a) 1000π Hz
b) 2000Hz
c) 20Hz
d) $\frac{1000}{\pi}Hz$

• 11. Electrostatics - Quiz

1. In briging an electron towards another electron, the electrostatic potential energy of the system
a) decreases
b) increases
c) remains same
d) becomes zero

2. Three point charges +q, -2q and +q are placed at points (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, Z = 0), respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are
a) $\sqrt{2}qa$ along +y direction
b) $\sqrt{2}aq$ along the line joining points (x = 0), y = 0, z = 0) and (x = a, y = a, z = 0)
c) qa along the line joining points  (x = 0), (y = 0, z = 0) and (x = a, y = a, z = 0)
d) $\sqrt{2}aq$ +x direction

• 12. Current Electricity - Quiz

1. Resistivity of potentimeter wire is 10-7 Ω-m and its area of cross-section is 10-6 m2 . When a current i = 0.1 A flows through the wire, its potential gradient is
a) 10-2 V/m
b) 10-4 V/m
c) 0.1 V/m
d) 10 V/m

2. There are  three copper wires of length and cross - sessional area (L,A), (2L, (1/2)A), ((1/2)L,2A) . In which case is the resistance minimum?
a) It is the same in all three cases
b) Wire of cross-sessional area 2A
c) Wire of cross-sessional area A
d) Wire of cross-sessional area $\frac{1}{2}A$

• 13. Thermal and Chemical Effects of Current - Quiz

1. 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

2. Two bulbs 25 W, 220 V and 100W, 220V are given. Which has higher resistance?
a) 25 W bulb
b) 100 W bulb
c) Both bulbs will have equal resistance
d) Resistance of bulbs cannot be compared

• 14. Magnetic Effects of Current - Quiz

1. At what distance from a long straight wire carrying current of 12A will the magnetic field be equal to 3×10-5 Wb/m2 ?
a) 8 × 10-2 m
b) 12 × 10-2 m
c) 18 × 10-2 m
d) 24 × 10-2 m

2. The magnetic field of a given length of wire carrying a current for a single turn circular coil at centre is B, then its value for two turns for the same wire when same current passing through it is
a) $\frac{B}{4}$
b) $\frac{B}{2}$
c) 2B
d) 4B

• 15. Magnestism - Quiz

1. Two bar magnets having same geometery with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are on the same side, then its period of oscillation is t1 . Now the polarity of one of the megnets is reversed the time period of oscillations becomes T2 , Then
a) $T_{1} < T_{2}$
b) $T_{1} > T_{2}$
c) $T_{1} = T_{2}$
d) $T_{2} = \infty$

2. A bar magnet of magnetic moment $\vec{M}$ Is placed in a magnetic field of induction $\vec{B}$ The torque external on it is
a) $\vec{M}$.$\vec{B}$
b) $-\vec{M}$.$\vec{B}$
c) $\vec{M}$x$\vec{B}$
d) $-\vec{M}$x$\vec{B}$

• 16. Electromagnetic Induction - Quiz

1. The magnetic flux through a circuit of resistance R changes by an amount ΔΦ in a Δt. Then the total quantity of electric charge q that passes any point in the circuit during the time Δt is represented by
a) q = $\frac{1}{R}.\frac{\Delta\phi}{\Delta t}$
b) q = $\frac{1}{R}.\frac{\Delta\phi}{R}$
c) q = $\frac{\Delta\phi}{\Delta t}$
d) q = R.$\frac{\Delta\phi}{\Delta t}$

2. A 100 mH coil carries a current of 1 A. Energy stored in its magnetic field is
a) 0.5 J
b) 1 A
c) 0.05 J
d) 5 A

• 17. AC and Electromagnetic Waves - Quiz

1. In an AC circuit the emf (V) and the current (i) at any instant are given respectively by
V = V0 sinωt
I = i0 sin(ωt - Φ)
The average power in the circuit over one cycle of AC is
a) $\frac{V_{0}i_{0}}{2}$
b) $\frac{V_{0}i_{0}}{2}sin\phi$
c) $\frac{V_{0}i_{0}}{2}cos\phi$
d) V0i0

2. 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

• 18. Ray Optics and Optical Instruments - Quiz

1. A planoconvex lens is made of material of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
a) 50 cm
b) 100 cm
c) 200 cm
d) 400 cm

2. The refractive index of the material of a prism is $\sqrt{2}$ and its refracting angle is 300 . One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface, if its angle of incidence on the prism is
a) 450
b) 600
c) 00
d) 300

• 19. Electrons and Photons - Quiz

1. The following particles are moving with the same velocity, then maximum de-Broglie wavelength will be for
a) Protons
b) α-particle
c) neutrons
d) β-particle

2. Photoelectric work function of a metal is 1 eV. light of wavelength λ = 3000Å falls on it. The photoelectric come out with velocity
a) 10 m/s
b) 102 m/s
c) 104m/s
d) 106m/s

• 20. Atomic Physics - Quiz

1. The ground state energy of H-atom is 13.6 eV. The energy needed to ionize H-atom from its second excited state
a) 1.51eV
b) 3.4 eV
c) 13.6 eV
d) 12.1 eV

2. The spectrum obtained from a sodium vapour lamp is an example of
a) band spectrum
b) continuous spectrum
c) emission spectrum
d) absorption spectrum

• 21. Nuclear Physics - Quiz

1. A nuclear decay is expressed as
6C115β11 + β+ + X
Then the unknown particle X is
a) neutron
b) antineutrino
c) proton
d) neutrino

2. The average binding nergy of nucleon inside an atomic nucleus is about
a) 8 MeV
b) 8 eV
c) 8 J
d) 8 erg

• 22. Solid and Semiconductors Devices - Quiz

1. Barrier potential of p-n junction diode does not depend on
a) forward bias
b) doping density
c) diode design
d) temperature

2. The number of atoms per unit cell in bcc lattice is
a) 1
b) 2
c) 4
d) 9