Which of the following instrument has the least count of 0.01 mm in general.
A) Screw gauge B) Vernier calliper C) Thermometer D) None of the above The correct option is A) Screw gauge.... View Article
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A radio wave has a maximum magnetic field induction of 10-4 T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is? (1) Zero (2) 3 × 104 V/m (3) 5.8 × 10-9 V/m (3) 3.3 × 10-13 V/m
Answer: (2) 3 × 104 V/m Given E0 = cB0 c = 3 × 108 B0 = 10-4 E0 = 3 × 108 × 10-4 E0 = ... View Article
Whenever the magnetic flux () linked with a coil changes the emf is induced in the circuit, This emf lasts
as long as the change in flux continues.
Find the resistance between a and b in the circuit given below:
Use the laws of resistances in series and parallel.
A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (∠i), refraction (∠r) and emergence (e) as shown. Which angle or angles have not been marked correctly?
∠i and ∠e are not marked correctly. Each angle is supposed to be marked from the normal.
Which sentence best describes the athlete whose distance-time graph is shown below?
Both segments of this graph have a positive slope, so the athlete is running forward the whole time. The first... View Article
Alex walks along a curved path and takes several turns while walking from home to school. How can you best describe his displacement?
To define displacement we need both: the distance travelled and the direction.
Use the following information to answer the next question. It will be observed that
An object floats in a liquid if its density (or average density) is less than that of the liquid. In... View Article
A body of weight W, experiences an upthrust R in water. What will be the apparent weight of the body and apparent density of the body when W>R?
The apparent weight will be (W – R) and the apparent density will be (p – 1) gcm-3
Identify the circuit in which the electrical components have been properly connected.
An ammeter is always connected in series and a voltmeter in parallel and current always flows from the negative terminal... View Article
If a train is traveling due north and its brakes are applied, it will have?
Since the brakes are applied, acceleration is in the opposite direction to motion. So, the speed decreases.
Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?
Here, total resistance of the circuit = 2R+3R+R = 6R Total emf = E Hence, total current in the circuit... View Article
What is the average power/cycle in a capacitor?
The average power/cycle in a capacitor is 0.
Television signals broadcast from the moon can be received on the earth while the TV broadcast from Delhi cannot be received at places about 100 km distant from Delhi. This is because
Over a long distance, earths’ surface will be curved and since TV signals travel in straight line television broad cast... View Article
A 2.16 g of a substance occupies 1.5 cm3. Its density to appropriate significant figure is:
There are 3 significant figures in measured mass whereas there are only 2 significant figures in measured volume. Hence density... View Article
The given symbol is used for representing _______ in a circuit.
When wires cross without joining, a slight jump is shown between the two wires.
STATEMENT-1: Charges experience force when they move at right angles to magnetic field. BECAUSE STATEMENT-2: A moving charge produces an electric field only.
A moving charge produces electric as well as magnetic field.
Complete the sentence, The Sun has been radiating an enormous amount of energy at the present rate for nearly——- years and will continue radiating at that rate for about ——– years more.
The Sun has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and... View Article
The focal length of a convex lens is
The focal length of a convex lens is always positive in accordance with the sign convention.
A ray of light incident on the optical centre of a spherical lens, after refraction passes through:
A ray of light passes through optical centre of a lens is refracted back along the same path i.e. through... View Article
