Total Number of Question/s - 6437

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  • 1. Physical World - Quiz


    1. The sciences which deal with _________are called physical sciences.
    a) living things
    b) non-living things.
    c) both a and b
    d) none of these

    2. Einstein was awarded Nobel Prize in Physics for
    a) Theory of relativity
    b) Law f gravitation
    c) Uncertainty Principle
    d) Photo electricity

  • 2. Units and Measurements - Quiz


    1. The best method to reduce random error is
    a) To change the instrument used for measurement
    b) To take help of experienced observer
    c) To repeat the experiment many times and to take the average results
    d) None of the above

    2. Maximum __________error in product or______________of two quantities is____________of__________errors in__________.
    a) fractional; division; sum; fractional; individual quantities
    b) individual quantities; fractional; division; sum fractional
    c) both a and b
    d) none of these

  • 3. Motion in a Straight Line - Quiz


    1. When the speed of a car is u, the minimum distance over which it can be stopped is s. If the speed becomes nu, what will be the minimum distance over which it can be stopped during the same time?
    a) s/n
    b) ns
    c) s/n2
    d) n2s

    2. A police party is chasing a dacoit in a jeep which is moving at a constant speed v. The dacoit is on a motorcycle . When he is at a distance x from the jeep, he accelerates from rest at a constant rate? Which of the following relations is true if the police is able to catch the dacoit?
    a) v2 ≤ αx
    b) v2 ≤ 2αx
    c) v2 ≥ 2αx
    d) v2 ≥ αx

  • 4. Motion in a Plane - Quiz


    1. A man swims from a point A on one bank of a raver of width 100m. When he swims perpendicular to the water current, he reaches the other bank 50m downstream. The angle to the bank at which he should swim, to reach the directly opposite point B on the other bank is

    a) 100 upstream
    b) 200 upstream
    c) 300 upstream
    d) 600 upstream

    2. A ball is projected from a point A with some velocity at an angle 300 with the horizontal as shown in Fig. . Consider a target at point B. The ball will hit the target if it is thrown with a velocity v0 equal to

    a) 5 ms-1
    b) 5 ms-1
    c) 7 ms-1
    d) None of these

  • 5. Laws of Motion - Quiz


    1. In moving a body of mass m up and down a rough incline of inclination θ work done is (S is length of the plank, and μ is coefficient of friction).
    a) mg sin θ x S
    b) mg cos θ = S
    c) 2 μ mg cos θ x S
    d) Zero

    2. A car of mass m starts from rest and acquires a velocity along east v = $v\vec{i}\left (v > 0 \right )$ in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is
    a) mv/2 eastward and is exerted by the car engine.
    b) mv/2 eastward and is due to the friction on the tyres exerted by the road.
    c) more than mv/2 eastward exerted due to the engine and overcome the friction of the road.
    d) mv/2 exerted by the engine

  • 6. Work, Energy and Power - Quiz


    1. A weightlifter lifts a weight off the ground and holds it up, then
    a) Work is done in lifting as well as holding the weight
    b) No work is done in both lifting and holding the weight
    c) Work is done in lifting the weight but no work is required to be done in holding it up
    d) No work is done in lifting the weight but work is required to be done in holding it up

    2. When the K.E. of a body is increased by 300%, the momentum of the body is increased by
    a) 20%
    b) 50%
    c) 100%
    d) 200%

  • 7. System of Particles and Rotational Motion - Quiz


    1. A flywheel of moment of interia 3 x 102 kg m2 is rotating with uniform angular speed of 4.6 rad s-1. If a torque of 6.9 x 102 Nm retards the wheel, then the time in which the wheel comes to rest is
    a) 1.5 s
    b) 2 s
    c) 0.5 s
    d) 1 s

    2. The rotational analgue of force is
    a) Momentum
    b) Angular momentum
    c) Torque
    d) None of these

  • 8. Gravitation - Quiz


    1. A satellite is moving around the earth with speed υ in a circular orbit of radius r. If the orbit radius is decreased by 1% its speed will
    a) increase by 1%
    b) increase by 0.5%
    c) decrease by 1%
    d) decrease by 0.5%

    2. The distance between the centres of the Moon and the earth is D. The mass of the earth is 81 times the mass of the Moon. At what distance from the distance from the centre of the earth, the gravitational force will be zero?
    a) $\frac{D}{2}$
    b) $\frac{2D}{3}$
    c) $\frac{4D}{3}$
    d) $\frac{9D}{10}$

  • 9. Mechanical Properties of Solids - Quiz


    1. Two parallel wires each of length 10 cm are 0.5 cm apart. A film of water is formed between them . If surface tension of water is 0.072 N/m, then the work done in increasing the distance between the wires by 1mm is
    a) 1.44 x 10-5 J
    b) 1.72 x 10-5 J
    c) 1.44 x 10-4 J
    d) 1.72 x 10-4 J

    2. A parrot sitting on the floor of a wire cage which is being carried by a boy starts flying. The boy will feel that the box is now
    a) Heavier
    b) Lighter
    c) Shows no change in weight
    d) Lighter in beginning and heavier later.

  • 10. Mechanical Properties of Fluids - Quiz


    1. A particle is placed at the origin and a force F = kx is acting on it (where k is a positive constant. If U(0)= 0, the graph of U(x) verses x will be (where U is the potential energy function ).

    2. A ball is made of a material of density ρ where ρ oil < ρ < ρwater with ρoil and ρwater representing the densities of oil and water, respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, which of the following pictures represents its equilibrium position?

  • 11. Thermal Properties of Matter - Quiz


    1. A glass cylinder contains m0 = 100g of mercury at a temperature of t0 = 00C . When temperature becomes t1 = 200C the cylinder contains m1 = 99.7 g of mercury . The coefficient of volume expansion of mercury γHe = 18 x 10-5/0C. Assume that the temperature of the mercury is equal to that of the cylinder. The coefficient of linear expansion of glass α is
    a) $10^{-5}/^{0}C$
    b) $2 \times 10^{-5}/^{0}C$
    c) $3 \times 10^{-5}/^{0}C$
    d) $6 \times 10^{-5}/^{0}C$

    2. A steel ball of mass m1 = 1kg moving with velocity 50m/s collides with another ball of mass m2 = 200g lying on the ground. During the collision their internal energies change equally and T1 and T2 are the rise in temperature of masses m1 and m2, respectively. If specific heat of steel is 0.105 and J = 4.18 J/cal, then
    a) T1 = 7.10C and T2 = 1.470C
    b) T1 = 1.470C and T2 = 7.10C
    c) T1 = 3.4K and T2 = 17.0K
    d) T1 = 7.1K and T2 = 1.4 K

  • 12. Thermodynamics - Quiz


    1. During an isothermal expansion , a confined ideal gas does -150J of work against its surroundings. This implies that
    a) 150J of heat has been removed from the gas
    b) 300J of heat has been added to the gas
    c) no heat is transferred because the process is isothermal
    d) 150J of heat has been added to the gas

    2. When a cyclic path is traced in anticlockwise direction, net work is done by the gas
    a) True
    b) False

  • 13. Kinetic Theory - Quiz


    1. P-V diagram of an ideal gas is as shown in Fig fig. Work done by the gas in the process ABCD is

    a) $4P_{0}V_{0}$
    b) $2P_{0}V_{0}$
    c) $3P_{0}V_{0}$
    d) $P_{0}V_{0}$

    2. A vessel contains a mixture of 7g of nitrogen and 11g of carbon dioxide at temperature T = 300K. If the pressure of the mixture is 1atm (1 x 105 N/m2), its density is (gas constant R = 25/3 J/mol K)
    a) $0.72 kg/m^{3}$
    b) $1.44 kg/m^{3}$
    c) $2.88 kg/m^{3}$
    d) $5.16 kg/m^{3}$

  • 14. Oscillations - Quiz


    1. The function sin4(ωt)represents
    a) a simple harmonic motion with a period Ï€/ω
    b) a simple harmonic motion with a period 2Ï€/ω
    c) a periodic , but not simple harmic motion with a period Ï€/ω
    d) a periodic but not simple harmonic motion with a periodid 2Ï€/ω

    2. The square of frequency of vibration (n2) of a given length of sonometer wire varies with tension T in (figure) as

  • 15. Waves - Quiz


    1. A motorcycle starts from rest and accelerates along a straight line at 2.2 m/s2. The speed of sound is 330m/s. A siren at the starting point remains stationary. When the driver hears the frequency of the siren at 90% of when the motorcycle is stationary, the distance travelled by the motorcyclist is
    a) 123.75 m
    b) 247.5 m
    c) 495 m
    d) 990m

    2. To decrease the fundamental frequency of a stretched string fixed at both ends one might
    a) increase its tension
    b) increase its wave velocity
    c) increase its length
    d) decrease its linear mass density

  • 16. Scalar and Vector - Quiz


    1. In a two-dimensional motion of a particle, the particle moves from point A, with position vector $\vec{r}_{1}$, to point B, with position vector. $\vec{r}_{2}$. If the magnitudes of these vectors are respectively ,r1 = 3 and r2 = 4 and the angles they make with the x-axis are, θ1 = 750 and θ2 = 150, respectively, then find the magnitude of the displacement vector

    a) 15
    b) $\sqrt{13}$
    c) 17
    d) $\sqrt{15}$

    2. Given that $\vec{A} + \vec{B}$ = $\vec{C}$. If $|\vec{A}|$ = 4, $|\vec{B}|$ = 5 and $|\vec{C}|$ = $\sqrt{61}$, the angle between $\vec{A}$ and $\vec{B}$ is
    a) 300
    b) 600
    c) 900
    d) 1200

  • 17. Conservation of momentum and Collision - Quiz


    1. A U-shaped wire has a semicircular bending between A and B as shown in Figure. A bead of mass m moving with uniform speed through a wire enters the semicircular bend at A and leaves at B with velocity v/2 after after time T. The average force exerted by the bead on the part AB of the wire is

    a) 0
    b) $\frac{3mv}{2T}$
    c) $\frac{3mv}{T}$
    d) none of these

    2. A ball of mass m is released from rest relative to elevator at a height h1 above the floor the floor of the elevator. After making collision with the floor of the elevator it rebounces to height h2. The coefficient of resitution for collision is e. For this situation, mark the correct statement(s).

    a) If elevator is moving down with constant velocity v0, then h2 = e2h1
    b) If elevator is moving down with constant velocity v0 , then h2 = e2h1 - $\frac{v^{2}_{0}}{2g}$.
    c) If elevator is moving down with constant velocity v0, then impulse imparted by floor of the elevator to the ball is $m(\sqrt{2gh_{2}}+\sqrt{2gh_{1}}+2v_{0})$ in the upward direction.
    d) If elevator is moving with constant acceleration of g/4 in upward direction, then it is not possible to determine a relation between h1 and h2 from the given information.

  • 18. Rotational Dynamics - Quiz


    1. A yo-yo is placed on a rough horizontal surface and a constant force F, which is less than its weight, pulls it vertically. Due to this

    a) friction force acts towards left, so it will move towards left
    b) friction force acts towards right, so it will move towards right
    c) it will move towards left, so friction force acts towards left
    d) it will move towards right so friction acts towards right

    2. In the figure shown, a small ball of mass m can move without sliding in a fixed semicircular track of radius R in a vertical plane. It is released from the top. The resultant force on the ball at the lowest point of the track is

    a) $\frac{10mg}{7}$
    b) $\frac{17mg}{7}$
    c) $\frac{3mg}{7}$
    d) zero

  • 19. Fluid Dynamics - Quiz


    1. The minimum horizontal acceleration of the container so that the pressure at point A of the container becomes atmospheric is (the tank is of sufficient height)

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

    2. An ideal fluid flows in the pipe as shown in the figure. The pressure in the fluid at the bottom P2 is the same as it is at the top P1. If the velocity of the top v1 = 2 m/s. Then the ratio of areas A1/A2 is

    a) 2: 1
    b) 4:1
    c) 8:1
    d) 4:3