161- In standing waves, the distance between two consecutive nodes or antinodes is:
A. λ
B. λ/2
C. 2λ
D. λ/4
View Answer
Answer : B. λ/2
Description
162- If the fundamental frequency of vibration of a string fixed at both ends is 50 Hz, the fourth harmonic will be:
A. 200 Hz
B. 150 Hz
C. 12.5 Hz
D. 250 Hz
View Answer
Answer : A. 200 Hz
Description
163- A ball is thrown horizontally with 19.6 m/s. After 2 seconds its horizontal velocity component will be:
A. 4.9 m/s
B. 9.8 m/s
C. 19.6 m/s
D. 39.2 m/s
View Answer
Answer : C. 19.6 m/s
Description
164- In the projectile motion, the acceleration in the horizontal direction:
A. Is zero
B. Varies with time
C. Remains same
D. Is positive
View Answer
Answer : A. Is zero
Description
165- In vibratory motion the maximum displacement of the body on either side of its equilibrium position is called:
A. Distance
B. Displacement
C. Frequency
D. Amplitude
View Answer
Answer : D. Amplitude
Description
166- The process in which no external work is performed is called:
A. Isobaric
B. Isochoric
C. Isothermal
D. Adiabatic
View Answer
Answer : B. Isochoric
Description
167- Induced EMF in A.C. generator can be increased by:
A. Decreasing area of coil
B. Increasing area of coil
C. Decreasing magnetic field
D. Slowing down speed of coil
View Answer
Answer : B. Increasing area of coil
Description
168- A transformer is used to:
A. Transform alternating current and voltage
B. Convert alternating current into direct current
C. Convert mechanical energy into electrical energy
D. Convert direct current into alternating current
View Answer
Answer : A. Transform alternating current and voltage
Description
169- A semi-conductor diode can be used as:
A. A full wave rectifier
B. An amplifier
C. A transmitter
D. A half wave rectifier
View Answer
Answer : D. A half wave rectifier
Description
170- Half-life of radon gas is:
A. 3.8 minutes
B. 3.8 days
C. 3.8 months
D. 38 years
View Answer
Answer : B. 3.8 days
Description
171- Two capacitors 6µf and 12µf are in series connected across a 200 volts D.C. supply. Calculate the charges on each capacitor, respectively.
A. 8×10⁻⁶C, 8×10⁻⁶C
B. 8µC, 8µC
C. 8×10⁴C, 16×10⁴C
D. 800C, 800C
View Answer
Answer : A. 8×10⁻⁶C, 8×10⁻⁶C
Description
172- Soft cylindrical electrical conducting wire has resistance R. It is stretched so that its length is doubled but its radius stays constant. What would be the new resistance?
A. R/2
B. R
C. 4R
D. 2R
View Answer
Answer : D. 2R
Description
173- The speed of sound at 0°C in air is 332 m/s. What will be the speed of sound at 50°C?
A. 300 m/s
B. 332 m/s
C. 362 m/s
D. 382 m/s
View Answer
Answer : C. 362 m/s
Description
174- A force 2F acting on a particle of mass 10 kg produces an acceleration of 30 m/s². A force SF acting on a particle of mass M produces an acceleration of 25 m/s². What is the mass M?
A. 30 kg
B. 21 kg
C. 4.8 kg
D. 3.3 kg
View Answer
Answer : A. 30 kg
Description
175- The main function of a transformer is to convert:
A. One direct voltage to another direct voltage of different magnitude
B. One alternating voltage to another alternating voltage of different magnitude
C. High value alternating voltage to a low value direct voltage
D. A low value alternating voltage to a high value direct voltage
View Answer
Answer : B. One alternating voltage to another alternating voltage of different magnitude
Description
176- An atom makes a transition from a state of energy E2 to one of lower energy E1. Which of the following gives the wavelength of the radiation emitted, in terms of the Planck's constant h and the speed of light c?
A. E2-E1/hc
B. hc/E2-hc/E1
C. hc/E2-E1
D. c/h(E2-E1)
View Answer
Answer : C. hc/E2-E1
Description
177- Identify the fragment in the following options:
A. He went to the store
B. Quickly, before the rain started
C. The cat, sitting on the windowsill.
D. She had a delicious meal.
View Answer
Answer : B. Quickly, before the rain started
Description
178- Identify the sentence with the incorrect use of apostrophe:
A. That is Mary’s book.
B. The dog’s leash is in the car.
C. The children’s toys are in the box.
D. The children’s toys are in the box.
View Answer
Answer : D. The children's toys are in the box.
Description
179- Which sentence demonstrates the correct use of past tense?
A. She will go to the store yesterday
B. They will be eating lunch now
C. He had finished his homework before dinner.
D. We are meeting them tomorrow.
View Answer
Answer : C. He had finished his homework before dinner.
Description
180- Which of the following sentences has the correct word order?
A. She usually goes for jogging in evening.
B. In the evening goes she usually for jogging.
C. She goes to the usually for jogging evening.
D. Usually she for jogging goes in the evening.
View Answer
Answer : A. She usually goes for jogging in evening.
