Physics Padhai

Logical Question

Q1) The position of a particle in a rectangular coordinate system is (3,2,5). What will the position vector be?

1. 3i^+2j^+5k^
2. 3i^−2j^−5k^
3. 5i^+2j^+3k^
4. 2i^+5j^+3k^

 Q2)  What is the displacement vector of the particle that moves from point P (2,3,5) to point Q (3,4,5)?

1. i^+j^+5k^
2. 2i^+4j^+6k^
3. i^+j^
4. i^+j^  +10k^

Q3)  What is the vertical component of the force 5 N acting on a particle along a direction making an angle of 600 with vertical ?

1. 3 N
2. 2.5 N
3. 10 N
4. 4 N

Q4) Which of the following is a scalar quantity?

1. Acceleration
2. Electric Field
3. Work
4. Displacement

Q5) How many numbers of base SI units are there?

       a. 5

       b. 10

       c .7

       d .9

Q6) What is the dimensional formula of torque and energy

      a. [ML-3T-2] and [MLT-2]

      b.  [ML2T-2] and [MLT-2]

      c.  [ML2T-2] and [ML2T-2]

      d.  [MLT2] and [ML2T2]

Q7) What is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale. Given main scale reading is 0mm and circular scale reading is 52 division.

      a. 0.016 cm

      b. 0.052 cm

      c. 0.15 cm

      d. 0.05 cm

Q8) MKS system of measurements stands for?

      a. metre, kelvin. siemens

      b. metre , kilogram, second

      c. minute, kelvin, second

      d. metre , kilogram, siemens

Q9) If A is measured in metre, then physical quantity A is ?

      a. Length

      b. mass

      c. Force

      d. Current

Q10) Which the following is a dimensionless quantity

      a. Refractive index

      b. Gravitational constant

      c. Velocity

      d. Planck’s constant

Q11)The direction in which electromagnetic waves propagate is the same as that of

1. 
2. 
3. 
4. 

Q12) Which properties amount the following is false about electromagnetic waves?

1. The energy in an electromagnetic wave is divided equally between electric and magnetic vectors.
2. Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.
3. These waves do not require any material medium for propagation
4. Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time

Q13)Which of the following rays are not electromagnetic waves?

1. Gamma rays
2. Beta rays
3. Heat rays
4. X rays

Q14) A tuning fork of frequency 170 Hz produces sound waves of wavelength 2 m. Calculate speed of sound

1. 340 m/s
2. 632 m/s
3. 413 m/s
4. 229 m/s

Q15)Within elastic limit , stress is directly proportional to strain. Thus the slope of stress vs strain will give?

1. Modulus of elasticity
2. Poison's ratio
3. Stress
4. Elastic limit

Q16) Three resistor 6 ohm, 5 ohm, 3 ohm are connected in series. What is the effective resistance of the system.

       a.15 ohm

       b. 20 ohm

       c. 25 ohm

       d. 14 ohm

Q17) The angular velocity depends upon the rate of change of the?

      a. Angular acceleration
      b. Angular Distance.
      c. Angular Displacement.
      d. torque

Q18) A body is traveling in a circle at constant speed. It
      a. has an inward acceleration
      b. has constant velocity.
      c. has no acceleration
      d. has an outward radial acceleration

Q19) Young's modulus Y ×10^11 Pa (N/m2) for steel  is

      a. 3.1
      b. 5
      c. 2
      d. 2.6

Q20) When angular velocity changes with respect to time then?

      a. an angular acceleration is produced
      b. a linear acceleration is produced
      c. it constitute a couple
      d. a linear velocity is produced

Q21)Two charges of 1.0 C each are placed 2 meter apart in free space. The force between them will be .

      a. 2.25 x 10^9
      b. 3.00 x 10^9
      c. 4.50 x 10^9
      d. 2.25 x 10^-9

Q22) The path followed by a projectile is called its?

      a. Territory
      b. Treasury
      c. Tractor
      d. Trajectory

Q23) A body travels along the circumference of a circle of radius 2 m with a linear velocity of 6 m/s . Then its angular velocity is
      a. 6 rad /s
      b. 3 rad /s
      c. 2 rad / s
      d. 4 rad / s

Q24) A body is moving along a circle with an increasing speed. It possesses?
      a. centripetal acceleration only (ac)
      b. tangential acceleration only (ar)
      c. both tangential and centripetal acceleration (ar and ac)
      d. No acceleration

Q25)The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by

1. ε0/μ0−−−−−√
2. ε0μ0−−−−√
3. 1/ε0μ0−−−−√
4. μ0/ε0−−−−−√

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