Question: Ohm’s law defines
1. a resistance
2. current only
3. voltage only
4. both current and voltage
Answer: 2
Question: A car is moving with a uniform speed. However its momentum is changing. Then the car
1. may be on an elliptical path
2. is moving on a straight path without acceleration
3. is moving on a straight path with acceleration
4. is moving without any acceleration
Answer: 1
Question: Metal used to make wires for safety fuses must have
1. very low resistivity and high melting point
2. high resistivity and low melting point
3. low resistivity and low melting point
4. high resistivity and high melting point
Answer: 2
Question: A positively charged particle projected towards west is deflected towards north north by a magnetic field. The direction of the magnetic field is
1. towards south
2. towards east
3. in downward direction
4. in upwards direction
Answer: 1
Question: Specific gravity of silver is 11 and specific gravity of iron is 8. Which one among the following is the approximate relative of silver with respect to iron?
1. 1.4
2. 0.7
3. 3.0
4. 2.8
Answer: 1
Question: A force F is applied on a body (which moves on a straight line) for a duration of 3s. The momentum of the body changes from 10g cm/s to 40 g cm/s. The magnitude of the force F is
1. 10 dynes
2. 10 newtones
3. 120 dynes
4. 12 dynes
Answer: 1
Question: If an object undergoes a uniform circular motion, then its
1. acceleration remains uniform
2. velocity changes
3. speed changes
4. velocity remains uniform
Answer: 1
Question: A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by
1. Left-hand thumb rule for up-current and right-hand thumb rule for down-current.
2. Right-hand thumb rule for up-current and left-hand thumb rule for down-current.
3. Right-hand thumb rule for both up and down currents.
4. Left-hand thumb rule for both up and down currents.
Answer: 3
Question: An ant is moving on thin (negligible thickness) circular wire. How many coordinates do you require to completely describe the motion of the ant?
1. One
2. Two
3. Three
4. Zero
Answer: 3
Question: Magnetic Resonance Imaging (MRI) is used in medical diagnosis to obtain images of our internal body organs. This is primarily possible because
1. Our body possesses a permanent magnet
2. MRI uses an external magnet to generate a magnetic field in our body.
3. MRI uses an external electric field to generate magnetic field in our body.
4. Ions’ motion along our nerve cells generates magnetic fields.
Answer: 2
Question: An object is undergoing accelerated motion. Its rate of change in momentum is
1. A non-zero constant
2. zeo
3. not a constant
4. None of the above
Answer: 2
Question: A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is
1. Zero
2. Towards the centre of the circle.
3. Away from the centre along the radius of the circle
4. Perpendicular to the radius and along the velocity.
Answer: 2
Question: The displacement of a particle is given by x = cos2 wt. The motion is –
1. simple harmonic
2. periodic but not simple harmonic
3. non-periodic
4. None of the above
Answer: 2
Question: The spread in colours in a rainbow on sky is primarily due to
1. Dispersion of sunlight
2. Reflection of sunlight
3. Reflection of sunlight
4. Total internal reflection of sunlight
Answer: 1
Question: Gravitational force shares a common feature with electromagnetic force. In both cases, the force is –
1. Between massive and neutral objects
2. Between charged objects
3. A short range
4. A long range
Answer: 1