## Class/Course - Class XI

### Subject - Physics

#### Total Number of Question/s - 6437

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• 1. Physical World - Quiz

1. Size of universe is of the order of
a) 1018 m
b) 1026 m
c) 1040 m
d) 10-18 m

2. The sciences which deal with ___________are called__________
a) living things ; biological sciences.
b) biological sciences ; living things
c) living things ; living sciences
d) none of these

• 2. Units and Measurements - Quiz

1. The position x of a particle at time t is given by x = $\frac{V_{0}}{a}\left (1 - e^{-at} \right )$, where V0 is contant and a > 0 . The dimensions of V0 and a are
a) M0LT-1 and T-1
b) M0LT0 and T-1
c) M0LT-1 and LT-2
d) M0LT-1 and T

2. The dimensions of ε0μ0 are
a) [LT-1]
b) [LT-2]
c) [L2T-2]
d) [L-2T2]

• 3. Motion in a Straight Line - Quiz

1. The location of a particle is changed. What can we say about the displacement and distance covered by the particle?
a) Both cannot be zero
b) One of the two may be zero
c) Both must be zero
d) Both must be equal

2. A motion in which the distance of the moving particle from a fixed point is always constant during motion is called_______.
a) circular motion
b) rotatotary motion
c) oscillatory motion
d) rectilinear motion

• 4. Motion in a Plane - Quiz

1. An airplane moving horizontally with a speed of 180 kmh-1 drops a food packet while flying at a height of 490 m. The horizontal range of the food packet is g = 9.8 ms-2
a) 180 m
b) 980 m
c) 500 m
d) 670 m

2. A police van moving on a highway with a speed of 30 km h-1 fires a bullet at a thief car speeding away in the same direction with a speed of 192 kn h-1. If the muzzle speed of the bullet is 150 ms-1, with what speed does the bullet hit the theif car?
a) 105 ms-1
b) 210 ms-1
c) 315 ms-1
d) 205 ms-1

• 5. Laws of Motion - Quiz

1. A system of two blocks, a light string, and a light and frictionless pulley is arranged as shown in figure. The coefficient of friction between fixed incline and 10kg block is given by μs = 0.27 and μk = 0.20. If the system is released from rest, then find the acceleration of 10kg block.

a) Zero
b) 0.114 ms-2
c) 0.228 ms-2
d) 2.97 ms-2

2. Coefficient of limiting friction between any two surfaces in contact is always less than coefficient of kinetic friction between them.
a) True
b) False

• 6. Work, Energy and Power - Quiz

1. The block A and B shown in Fig. have the masses MA = 5kg and MB = 4kg. The system is released from rest. The speed of B after A has travelled a distance 11m along the incline is

a) $\frac{\sqrt{3}}{2}\sqrt{g}$
b) $\frac{\sqrt{3}}{4}\sqrt{g}$
c) $\frac{\sqrt{g}}{2\sqrt{3}}$
d) $\frac{\sqrt{g}}{2}$

2. Two men A and B, each weighing 80kgm run up the same stair case While A does it in 20s, B does it in 15s. The ratio of the powers developed by A and B is
a) $\frac{4}{3}$
b) $\frac{3}{4}$
c) $\frac{1}{2}$
d) $\frac{1}{4}$

• 7. System of Particles and Rotational Motion - Quiz

1. The correct relation between torque τ and angular momentum L is
a) τ = dL/dt
b) L = dτ/dt
c) τ = L x t
d) L = τ xt

2. A cyclinder of radius R and mass M rolls without slipping down a plane inclined at an angle θ. Coeff. Of friction between the cyclinder and the plane is μ. For what maximum inclination θ, the cyclinder rolls without slipping?
a) tan-1 μ
b) tan-1 (3μ)
c) tan-1 2 μ
d) tan-1 3/2 μ

• 8. Gravitation - Quiz

1. A rocket is launched vertically from the surface of the earth with an initial velocity of 10km s-1>. The maximum height attained by rocket is 2.56 × 104 km. [use g = 9.8 m/s2 and radius of earth= 6.4 × 106
a) √2gR
b) u2/2g
c) [2g/u2 - (1/R)]
d) [2g/u2-(1/R)]-1

2. In fig. 8(CF). 1 shows elliptical orbit of a planet m about the sun. s. The shaded area SCD is twice the shaded area SAB . If t1 is the time for the planet to move from from C to D and t2 is the time to move from A to B, then

a) t1 = 4t2
b) t1 = 2t2
c) t1 = t2
d) t1>t2

• 9. Mechanical Properties of Solids - Quiz

1. The length of a metal wire is l when the tension is F and x l when the tension is y F. Then the natural length of the wire is
a) ((x-y)l/(x-1) )
b) (( y-x)l/(y-1))
c) ((x-y)l/(x+1))
d) ((y-x)l/(y+1))

2. Two long metallic strips are joined together by two rivets each of radius 2 mm. Each rivet can withstand a maximum shearing stress of 1.5 x 109 N/m2. Assuming that each rivet shares the stretching load equally, the maximum tensile force the strip can exert without rupture is
a) 1.88 x 104 N
b) 3.8 x 104 N
c) 6 x 107 N
d) 3 x 104 N

• 10. Mechanical Properties of Fluids - Quiz

1. The reciprocal of viscosity is called _________.
a) Increase
b) Fluidity
c) Both a and b
d) None of these

2. Water is flowing continuously from a tap having an internal diameter 8 x 10-3 m. The water velocity as it leaves the tap is 0.4 ms-1. The diameter of the water stream at a distance 2 x 10-1 m below the tap is close to (g = 10 m/s2)
a) 7.5 x 10-3 m
b) 9.6 x 10-3 m
c) 3.6 x 10-3 m
d) 5.0 x 10-3 m

• 11. Thermal Properties of Matter - Quiz

1. The state of the rod, in which temperature of each part becomes and there is no further absorption of heat anywhere in the rod during propagation of heat is called__________.
a) Natural convection process
c) Both a and b
d) None of these

2. An iron rocket fragment initially at -1000C enters the earths atmosphere almost horizontally and quickly fused completely in atmosphere friction. specific heat of iron is 0.11 kcal/kg 0C its melting point is 15350C and the latent heat of fusion is 3kcals/kg. The minimum valocity with which the gragment must have entered the atmosphere is
a) 0.45 km/s
b) 1.32 km/s
c) 2.32 km/s
d) zero

• 12. Thermodynamics - Quiz

1. In the V-T diagram shown in fig. . Ehat is the relation between P1 and P2?

a) P2 = P1
b) P2>P1
c) P21
d) cannot say

2. When 1kg of ice at 00C melts to water at 00C, the resulting change in its enotropy, taking latent heat of ice to be cal/g is
a) 273 cal/K
b) 8×104 cal/K
c) 80 cal/K
d) 293 cal/K

• 13. Kinetic Theory - Quiz

1. Forty calories of heat is needed to raise the temperature of 1mol of an ideal monoatomic gas from 200C to 300 at a constant pressure. The amount of heat required to raise its temperature over the same interval at a constant volume (R = 2cal mol-1 K-1) is
a) 20 cal
b) 40 cal
c) 60 cal
d) 80 cal

2. Temperature remaining constant, the pressure of gas is decreasedby 20%. The percentage change in volume is
a) increased by 20%
b) decreased by 20%
c) increased by 25%
d) decreased by 25%

• 14. Oscillations - Quiz

1. The equation of a simple harmonic wave is given by y = 3sinÃâ‚¬/2(5-t-x) where x and y are in meters and t is in seconds. The ratio of maximum particle velocity to the wave velocity is
a) 2Ãâ‚¬
b) 3Ãâ‚¬/2
c) 3Ãâ‚¬
d) 2Ãâ‚¬/3

2. The equation of motion of a particle is x=acos(α t)2. The motion is
a) periodic but not oscillatory
b) periodic and oscillatory
c) oscillatory but not periodic
d) neither periodic nor oscillatory

• 15. Waves - Quiz

1. Water waves produced by a motoe bost sailing in water are
a) neither longitudinal nor tranverse
b) both, longitudinal and tranverse
c) only longitudinal
d) only tranverse

2. A cyllindrical tube, open at both end, has a fundamental frequency, f in air . The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of the air-coliumn is now
a) f
b) f/2
c) 3f/2
d) 2f

• 16. Scalar and Vector - Quiz

1. Vector $\vec{A}$ is 2 cm long and is 600 above the x-axis in the first quadrant. Vector $\vec{B}$ is 2 cm long is 600 below the x-axis in the fourth quadrant. The sum $\vec{A}$ + $\vec{B}$ is a vector of magnitude
a) 2 cm along positive y-axis
b) 2 cm along positive x-axis
c) 2 cm along negative y-axis
d) 2 cm along negative x-axis

2. The resultant of three vectors 1,2, and 3 units whose directions are those of the sides of an equilateral triangle is at an angle of
a) 300 with the first vector
b) 150 with the first vector
c) 1000 with the first vector
d) 1500 with the first vector

• 17. Conservation of momentum and Collision - Quiz

1. A gun of mass M, fires a shell of mass m horizontally and the energy of explosion is such as would be sufficient to project the shell vertically to a height h. The recoil velocity of the gun is
a) $\left ( \frac{2m^{2}gh}{M(m+M)} \right )^{\frac{1}{2}}$
b) $\left ( \frac{2m^{2}gh}{M(m-M)} \right )^{\frac{1}{2}}$
c) $\left ( \frac{2m^{2}gh}{2M(m-M)} \right )^{\frac{1}{2}}$
d) $\left ( \frac{2m^{2}gh}{2M(m+M)} \right )^{\frac{1}{2}}$

2. In a vertical plane inside a smooth hollow thin tube, a block of same mass as that of tube is released as shown in Figure. When it is slightly disturbed it moves towards right. By the time the block reaches the right end of the tube, the displacement of the tube will be (where R is the main radius of the tube, assume that the tube remains in vertical plane)

a) $\frac{2R}{\pi }$
b) $\frac{4R}{\pi }$
c) $\frac{R}{2}$
d) R

• 18. Rotational Dynamics - Quiz

1. A smooth inclined plane is fixed in a car accelerating at a = g tan θ. If the sphere is set pure rolling on the incline, then

a) it will continue rolling
b) it will slip down
c) its linear velocity will increase
d) its linear velocity will decrease

2. Two circular discs are of same thickness. The diameter of A is twice that of B. The moment of inertia of A as compared to that of B is
a) twice as large
b) four times as large
c) eight time as large
d) 16 times as large

• 19. Fluid Dynamics - Quiz

1. A small ball of density ρ is immersed in a liquid of density σ (>ρ) to a depth h and released. The height above the surface of water up to which the ball will jump is
a) $\left ( \frac{\sigma }{\rho }-1 \right )h$
b) $\left ( \frac{\rho }{\sigma }-1 \right )h$
c) $\left ( \frac{\rho }{\sigma }+1 \right )h$
d) $\left ( \frac{\sigma }{\rho }+1 \right )h$

2. Two unequal blocks placed over each other of different densities σ1 and σ2 are immersed in a fluid of density of σ. The block of density σ1 is fully submerged and the block of density σ2 is partly submerged so, that ratio of their masses is 1/2 and σ/σ1 = 2 and σ/σ2 = 0.5. Find the degree of submergence of the upper block of density σ2.
a) 50% submerged
b) 25% submerged
c) 75% submerged
d) Fully submerged