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Two uniform strings A and B made of steel are made to vibrate under the same tension. If the first overtone of A is equal to the second overtone of B and if the radius of A is twice that of B, the ratio of the length of the strings is (1) 1:2 (2) 1:3 (3) 1:4 (4) 1:5

Answer: (2) 1:3 Frequency of A = n1 Frequency of B = n2 ∴ 2n1 = 3n2 or \(\begin{array}{l}\frac{2}{2l_{1}}\sqrt{\frac{T}{m_{1}}} =... View Article

When a particle moves in a circle with a uniform speed (1) Its velocity and acceleration are both constant (2) Its velocity is constant but the acceleration changes (3) Its acceleration is constant but the velocity changes (4) Its velocity and acceleration both change.

Answer: (4) Its velocity and acceleration both change. In uniform circular motion speed is constant, but the direction is changing... View Article

When a charged particle moves perpendicular to a magnetic field, then (1) Speed of the particle is changed. (2) Speed of the particle remains unchanged. (3) Direction of the particle remains unchanged. (4) Acceleration of the particle remains unchanged.

Answer:(2) Speed of the particle remains unchanged. A force acting on a particle is said to perform work when there... View Article

The conversion of a moving coil galvanometer into a voltmeter is done by (1) introducing a resistance of large value in series (2) introducing a resistance of small value in parallel (3) introducing a resistance of large value in parallel (4) introducing a resistance of small value in series

The conversion of a moving coil galvanometer into a voltmeter is done by (1) introducing a resistance of large value... View Article

A long straight wire carrying a current of 30A is placed in an external uniform magnetic field of induction 4×10^-4T. The magnetic field is acting parallel to the direction of the current. The magnitude of the resultant magnetic induction in tesla at a point 2.0cm away from the wire is : [μ0 = 4π×10^-7Hm^-1] (1) 10^-4 (2) 3×10^-4 (3) 5×10^-4 (4) 6×10^-4

A long straight wire carrying a current of 30A is placed in an external uniform magnetic field of induction 4×10<sup>-4</sup>T.... View Article

A refrigerator works between 4⁰C and 30⁰C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is:(Take 1cal = 4.2Joules) (1) 2.365W (2) 23.65W (3) 236.5W (4) 2365W

Answer: (3) 236.5W Given T2 = 40C = 4 + 273 = 277 K T1 = 300C = 30 +... View Article

A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct? (1) x < 0, v < 0, a > 0 (2) x > 0, v < 0, a < 0 (3) x > 0, v < 0, a > 0 (4) x > 0, v > 0, a < 0

Answer: (1) x < 0, v < 0, a > 0 Displacement = Downward (x<0) Velocity = Downward (v<0) Acceleration... View Article

A long solenoid has 500 turns. When a current of 2 amperes is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4×10^-3 Web. The self-inductance of the solenoid is (1) 1.0 henry (2) 4.0 henry (3) 2.5 henry (4) 2.0 henry

A long solenoid has 500 turns. When a current of 2 amperes is passed through it, the resulting magnetic flux... View Article

A spherical conductor of radius 10 cm has a charge of 3.2×10^-7C distributed uniformly. What is the magnitude of electric field at a point 15cm from the centre of the sphere? (1/4π∈⁰= 9 × 10⁹Nm/C²) (1) 1.28 × 10⁵N/C (2) 1.28 × 10⁶N/C (3) 1.28 × 10⁷N/C (4) 1.28 × 10⁴N/C

Answer: (1) 1.28 × 105 N/C Given: The charge present inside the sphere (q) = 3.2×10-7C The electric field is... View Article

Positive deviation from ideal behaviour takes place because of (1) molecular interaction between atoms and PV/nRT>1 (2) molecular interaction between atoms and PV/nRT<1 (2) finite size of atoms and PV/nRT>1 (4) finite size of atoms and PV/nRT<1

Answer: (1) molecular interaction between atoms and PV/nRT>1 Gases have a tendency to deviate from their ideal behaviour, and there... View Article

A charged particle moves through a magnetic field perpendicular to its direction. Then (1) kinetic energy changes but the momentum is constant (2) The linear momentum changes but the kinetic energy is constant (3) Both linear momentum and kinetic energy of the particle are not constant (4) Both linear momentum and kinetic energy of the particle are constant

Answer: (2) The linear momentum changes but the kinetic energy is constant The path of motion of a charge particle... View Article

An insect trapped in a circular groove of radius 12 cm moves along the groove steadily and completes 7 revolutions in 100 sec. What is the angular speed and linear speed of motion? (1) 0.11 rad/s, 3.28 cm/s (2) 0.40 rad/s, 5 cm/s (3) 0.44 rad/s, 5.28 cm/s (4) None of these

Answer: (3) 0.44 rad/s, 5.28 cm/s Circular groove of radius = 12 cm Insects completes 7 revolutions in 100 sec... View Article

When no current is passed through a conductor (1) the free electrons do not move (2) the average speed of a free electron over a large period of time is zero (3) the average velocity of a free electron over a large period of time is zero (4) the average of the velocities of all the free electrons at an instant is zero

Answer: (3) the average velocity of a free electron over a large period of time is zero (4) the average... View Article

The deflection in a moving coil galvanometer is (1) Directly proportional to the torsional constant (2) Directly proportional to the number of turns in the coil (3) Inversely proportional to the area of the coil (4) Inversely proportional to the current flowing

Answer: (2) Directly proportional to the number of turns in the coil A moving coil galvanometer is an instrument which... View Article

Which of the following statements is true? (1) The total mass of the system remains the same in a chemical change (2) A chemical change is permanent and irreversible (3) A physical change is temporary and reversible (4) All of the above

Answer: (4) All of the above In a chemical change, the total mass of the system remains unchanged. This is... View Article

The vapour pressure of pure liquids A and B are 450 and 700 mm Hg, respectively at 350 K temperature. Find out the composition of the liquid mixture if the total vapour pressure is 600 mm Hg. Also, find the composition of the vapour phase.

Solution PA0 = 450 mmHg PB0 = 700 mmHg Ptotal = 600 mmHg Ptotal = PA + PB Ptotal =... View Article

Full Form of IPS

The full form of IPS is the Indian Police Service. It is among the top positions in this country in... View Article

Gandhiji visited Champaran in Bihar to inspire the peasants to struggle against oppressive ________. a)Revenue collection b)Plantation system c)Racial discrimination d)English education

Answer: The correct answer is option (b) – Plantation system. The British indigo planters meted out harsh treatment to peasants... View Article

What are the dual objectives of the Federal System, what is required to fulfill them? a)To ensure that power would be transferred from state to central government. b)To provide facilities and jobs to the citizens of the country. c) To distribute powers and funds to the Central Government. d) To promote unity of the country and to accommodate regional diversity.

Answer: The correct answer is option (d) – To promote unity of the country and to accommodate regional diversity. Hence,... View Article

Describe the meaning of Disaster Management.

Answer: Disasters can be natural or can be the result of human activities. It is particularly difficult to completely eliminate... View Article

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