Science Questions
All Science MCQs for CTEVT entrance exam.
A wire of resistance 4 Ohms is stretched to double its length. What is its new resistance?
In a series circuit of three identical resistors, the total power dissipated is P. If they are reconnected in parallel to the same source, the total power will be:
A cell of EMF 2V and internal resistance 0.5 Ohm is connected to an external resistance of 9.5 Ohms. What is the terminal potential difference?
Two copper wires A and B have lengths in ratio 1:2 and radii in ratio 2:1. The ratio of their resistances is:
A transformer is 90% efficient. If it consumes 1000W and the output voltage is 100V, what is the output current?
The drift velocity of electrons in a copper wire is of the order of:
What is the equivalent resistance of the network shown in the figure?
A 220V, 100W bulb and a 220V, 40W bulb are connected in series to a 220V supply. Which bulb will glow brighter?
Two charges of 1C each are placed 1m apart in vacuum. The force between them is:
Which of the following is used to convert a galvanometer into an ammeter?
Which of the following is used to convert a galvanometer into a voltmeter?
The Lenz's law is a consequence of the law of conservation of:
Four identical resistors each of resistance R are connected to form a square. The equivalent resistance between opposite corners is:
In a step-up transformer, the current in the secondary coil compared to the primary coil is:
Which of the following materials has a negative temperature coefficient of resistance?
What is the equivalent resistance of three resistors of 3 Ohms each connected in parallel?
If the current through a resistor is doubled, the power dissipated becomes:
A heater is marked 220V, 2200W. What is the current flowing through it?