A car of mass 1000 kg moves on a circular track of a radius of 40 m. If the coefficient of friction is 1.28, the maximum velocity with which the car can be moved, is:
 
1. 22.4 m/s2. 112 m/s3. 0.64×401000×100 m/s4. 1000 m/s

 

Subtopic:  Uniform Circular Motion |
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The escape velocity for the earth is 11.2 km/s. The mass of another planet 100 times mass of earth and its radius is 4 times radius of the earth. The escape velocity for the planet is
1. 280 km/s
2. 56.0 km/s
3. 112 km/s
4. 48 km/s

 

Subtopic:  Escape velocity |
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Light travels faster in air than in glass. This is in accordance with:

1. the wave theory of light.
2. the corpuscular theory of light.
3. Neither (1) nor (2)
4. Both (1) and (2)
Subtopic:  Huygens' Principle |
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The speed of air flow on the upper and lower surfaces of a wing of an aero plane is vand vrespectively. If A is the cross section area of the wing and p is the density of air, then the upward lift is

 

Subtopic:  Bernoulli's Theorem |
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A body is thrown with a velocity of 9.8 m/s making an angle of 30 ° with the horizontal. It will hit the ground after a time
1. 1.5s
2. 1s
3. 3s
4. 2s

 

Subtopic:  Projectile Motion |
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A radioactive element 90X238 decay into 83Y222. The number of -particles emitted are
1. 1
2. 2
3. 4
4. 6

 

Subtopic:  Types of Decay |
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Minimum excitation potential of Bohr's first orbit in hydrogen atom is
1. 3.6 V
2. 10.2 v
3. 13.6 V
4. 3.4 v
Subtopic:  Bohr's Model of Atom |
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A gas expands 0.25 m3 at constant pressure 103 N/m2, the work done is
1. 250 N
2. 250 W
3. 250 J
4. 2.5 erg

 

Subtopic:  Work Done by a Gas |
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The work done in increasing the size of a soap film for 10cm x 6m to 1Ocm x 11m is 3 x 10-4 J. The surface tension of the film is

 

Subtopic:  Surface Tension |
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A parallel plate condenser is filled with two dielectrics as shown in figure. Area of each pate is A m2and the separation is d meter. The dielectric constants are K1and K2 respectively. Its capacitance in farad will be 
 

 

Subtopic:  Dielectrics in Capacitors |
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