A pencil is placed upright at a distance of 10 cm from a convex lens of focal length 15 cm. The nature of the image of the pencil will be

• real, inverted and magnified

• real, erect and magnified

• virtual, erect and reduced

• virtual, erect and magnified

A lady is standing in front of a plane mirror at a distance of 1 m from it. She walks 60 cm towards the mirror. The distance of her image now from herself (ignoring the thickness of the mirror) is

• 40 cm

• 60 cm

• 80 cm

• 120 cm

123.

A simple circuit contains a 12 V battery and a bulb having 24 ohm resistance. When you turn on the switch, the ammeter connected in the circuit would read

• 0.5 A

• 2 A

• 4 A

• 5 A

Three resistors with magnitudes 2, 4 and 8 ohm are connected in parallel. The equivalent resistance of the system would be

• less than 2 ohm

• more than 2 ohm but less than 4 ohm

• 4 ohm

• 14 ohm

Consider the following circuit:

The equivalent resistance of the circuit will be

• 12 Ω

• $8\frac{11}{12}\Omega$

• $9\frac{1}{11}\Omega$

• $\frac{24}{25}\Omega$

A racing car accelerates on a straight road from rest to a speed of 50 m/s in 25 s. Assuming uniform acceleration ofthe car throughout, the distance covered in this time will be

• 625 m

• 1250 m

• 2500 m

• 50 m

A man weighing 70 kg is coming down in a lift. If the cable of the lift breaks suddenly, the weight of the man would become

• 70 kg

• 35 kg

• 140 kg

• Zero

A given conductor carrying a current of 1 A produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, the amount of heat produced will be

• 2000 J

• 4000 J

• 8000 J

• 1000 J

The impulse on a particle due to a force acting on it during a given time interval is equal to the change in its

• force

• momentum

• work done

• energy

Which one of the following is not a form of stored energy?

• Nuclear energy

• Potential energy

• Electrical energy

• Chemical energy