List of practice Questions

A rectangular tank of depth 4 m is full of water of refractive index \(\frac{4}{3}\). When viewed from the top, the bottom of the tank is seen at a depth of 
The total internal reflection in diamond makes it shine, because the critical angle of diamond is
Ghee is converted from liquid to solid state during winter season. This process is called
40 g of water at 60°C is added to. 60g of water at 30°C. The final temperature of their mixture is
Humidity means
Which among the following pair of units measure the temperature?
A bar magnet is moved towards a coil (a) slowly, (b) quickly. The induced EMF is
The magnetic field lines due to the horseshoe magnet between its poles are
A conductor moving with a speed of 20 m/s in the direction perpendicular to the direction of magnetic field of induction 0.5 T, induces an EMF of 5 V. The length of the conductor is
The material more suitable for core of the electromagnet is
An auto driver has started his auto with the help of a rope by pulling. The device used by him to convert mechanical energy to electrical energy is
The magnetic force acting on a moving charge is given by the product of three quantities, namely
Two currents 0.5 mA and 5 mA flow towards the junction in a circuit and three currents 1 mA, x and 2 mA flow away from the junction. The value of x (in mA) is
The work done by an electric force in moving a unit positive charge from one point to another point in a circuit is called
When both the length and area of cross-section of a wire are doubled, then the resistance will be
The material which has a resistivity value of about 10x1010 Ω-m at 20 °C is
Four resistors each of 1.5 Q are arranged in the form of a parallelogram. The equivalent resistance between any two opposite corners is
Volt is the SI unit of
A bulb draws a current of 0-2 A from a 220 V source. The resistance of the filament of the bulb is
A person cannot see objects clearly beyond 40 cm. The power of the lens to correct vision is
In a glass prism
Pick the correct answer from the following two statements:
(A) In VIBGYOR, wavelength increases from violet to red. 
(B) In VIBGYOR, refractive index increases from violet to red. 
The sensation of vision on the retina is carried to the brain by
For a person with myopia defect, the maximum focal length of the eye-lens is
Four equal circles, each of radius 7 cm, touch each other and a square ABCD is formed through the centres, A, B, C, D of these circles as shown in the figure. Then the area of the shaded region is