Multiple choice question for engineering
1. The chemical formula of zeolite is
b) Al2(SO4)3.18 H2O
2. Which of the following is not naturally occurring zeolite?
3. Natural zeolites are
d) Possess gel structure
4. State true or false. Synthetic zeolites possess higher exchange capacity per unit weight compared to natural zeolites.
5. The exhausted zeolite is reclaimed by treating the bed with
a) Conc. NaCl
b) Conc. HCl
c) Conc. H2SO4
d) Dil. HCl
6. Select the incorrect statement from the following option.
a) The capital cost for zeolite process is high
b) The residual hardness in zeolite process is 0-15 ppm
c) The raw water used should be turbid and acidic
d) Automation is possible in zeolite process
7. In zeolite process, the exchange of ___________ takes place.
c) Both cations and anions
d) No ions exchange
8. The hardness of 1000 litres of a water sample was removed by passing it through a zeolite softener which required 30litres of NaCl solution containing 1.5 gm/L NaCl for regeneration. The hardness of water sample will be
a) 54.2 ppm
b) 12.9 ppm
c) 45 ppm
d) 38.46 ppm
9. Which of the following cannot be used in place of NaCl?
10. Natrolite is an example of
a) Synthetic zeolite
b) Natural zeolite
1. A body can have energy without momentum. True or false?
2. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that
a) Its velocity is constant and kinetic energy is constant
b) Its acceleration and velocity is constant
c) Its kinetic energy is constant and it moves in a circular path
d) Its acceleration is constant and it moves in a circular path
3. An athlete in the Olympic game covers a distance of 100m in 10s. His kinetic energy can be estimated in the range
a) 200J – 500J
b) 2×105J – 3×105J
c) 20000J – 50000J
d) 2000J – 5000J
4. A particle of mass 100g is thrown vertically upwards with a speed of 5m/s. The work done by the force of gravity during the time the particle goes up is
5. Statement 1: Linear momentum of a system of particles is zero
Statement 2: Kinetic energy of a system of particles is zero
a) 1 does not imply 2 and 2 does not imply 1
b) 1 implies 2 but 2 does not imply 1
c) 1 does not imply 2 but 2 implies 1
d) 1 implies 2 and 2 implies 1
6. A spherical ball of mass 20kg is stationary at the top of a hill of height 100m. It rolls down a smooth surface to the ground, then climbs up another hill of height 30m and finally rolls done to a horizontal base at a height of 20m above the ground. The velocity attained by the ball is
7. If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should
b) Remain unchanged
d) First increase and then decrease
8. A body moves a distance of 10m under the action of force F = 10N. If the work done is 25 J, the angle which the force makes with the direction of motion is
d) None of these
9. Two bodies of mass and 4m have equal kinetic energy. What is the ratio of their momentum?
1. The volume o an auditorium is 12,000m3. Its reverberation time is 1.5 seconds. If the average absorption coefficient of interior surfaces is 0.4 Sabine/m2. Find the area of interior surfaces.
2. The intensity of sound produced by roaring of a lion at a distance of 5m is 0.01W/m2. Calculate the intensity level in decibel.
3. Calculate the intensity level of a plane just leaving the runway having sound intensity of about 1000W/m2.
4. Frequency is used for tuning musical instruments. True or false?
5. A tuning fork produces 4 beats/s when sounded with a tuning fork of frequency 512Hz.The same tuning fork when sounded with another tuning fork of frequency 514Hz produces 6 beats/s. Find the frequency of the tuning fork.
6. When a train, blowing its whistle, approaches him, the pitch of the whistle appears to rise and it appears to drop as the engine moves away from him. What is the effect observed here?
a) Doppler effect
b) Frequency effect
d) Echelon effect
7. In which of the following is the Doppler Effect symmetric?
8. What will be the velocity of sound in a perfectly rigid rod?
9. The speed of sound in moist air is greater than that in dry air. True or false?
10. The sound of a bomb explosion travels faster than the sound produced by a humming bee. True or false?
11. When can sound be heard over long distances?
a) On a sunny day
b) On a humid day
c) When snowing
d) On a rainy day
12. A person riding on a merry-go round emits a sound wave of a certain frequency. Will the person at centre observe Doppler Effect?
1. When does a normal conductor become a superconductor?
a) At normal temperature
b) At Curie temperature
c) At critical temperature
2. In which of the following does the residual resistivity exist?
a) Impure metal at high temperature
b) Pure metal at low temperature
c) Pure metal at high temperature
d) Impure metal at low temperature
3. Meissner effect occurs in superconductors due to which of the following properties?
a) Diamagnetic property
b) Magnetic property
c) Paramagnetic property
d) Ferromagnetic property
4. What happens when a large value a.c. current is passed through super conductors?
a) Conductivity increases
b) Superconducting property is destroyed
c) It acts as a magnet
d) It becomes resistant
5. How is persistent current produced in supermagnets?
a) By passing ac current
b) By magnetising it
c) By passing dc current
d) By increasing the resistance
6. Superconductors can be used as a memory or storage elements in computers. True or false?
7. Superconducting tin has a critical temperature of 3.7K at zero magnetic field and a critical field at 0.0306 Tesla at 0K. Find the critical field at 2K.
a) 0.0306 Tesla
b) 7.4 Tesla
c) 0.02166 Tesla
d) 0 Tesla
8. Calculate the critical current for a wire of lead having a diameter of 1mm at 4.2 K. Calculate temperature for lead is 7.18 K and Hc = 6.5×104 A/m. Critical field is 42.758×103 A/m.
a) 3.5593 A
b) 27.3 A
c) 46.67 A
d) 134.26 A
1. A simple pendulum performs simple harmonic motion about x = 0 with an amplitude a and time period T. The speed of the pendulum at x = a/2 will be
d) (3π2 a)/T
2. A body is executing simple harmonic motion. When the displacements from the mean position are 4cm and 5cm, the corresponding velocities of the body are 10cm/sec and 8cm/sec. Then the time period of the body is
a) 2π sec
b) π/2 sec
c) π sec
d) 3π/2 sec
3. The total energy of a particle performing simple harmonic motion depends on
a) k, a, m
b) k, a
c) k, a, x
d) k, x
4. The particle executing simple harmonic motion has a kinetic energy K0 cos2 ωt. The maximum values of the potential energy and the total energy are respectively
a) Kc/2 and K0
b) K0 and K0
c) K0 and 2K0
d) 0 and 2K0
5. A linear harmonic oscillator of force constant 2×106 N/m and amplitude 0.01m has a total mechanical energy of 160J. Its
a) Potential energy is 160 J
b) Potential energy is zero
c) Potential energy is 100J
d) Potential energy is 120J
6. The potential energy of a simple harmonic oscillation when the article is halfway to its end point is
a) 2/3 E
b) 1/8 E
c) ¼ E
d) ½ E
7. In a simple harmonic motion, when the displacement is one half the amplitude, what fraction of the total energy is kinetic?
8. A body executes simple harmonic motion with amplitude A. At what displacement from the mean position is the potential energy of the body one fourth of its total energy?
d) Some other fraction of A
9. A loaded vertical spring executes simple harmonic motion with a time period of 4 sec. The difference between the kinetic energy and potential energy of this system varies with a period of
a) 2 sec
b) 1 sec
c) 8 sec
d) 4 sec
10. A mass m is vertically suspended from a spring of negligible mass; the system oscillates with a frequency n. What will be the frequency of the system, if a mass 4m is suspended from the same spring?