Physics PYQ — Page 2

Assertion (A): A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium. Codes:

Which one of the following types of glass can cut off ultraviolet rays?

Four wires of same material and of dimensions as under are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

Consider the following statements: 1. If magenta and yellow coloured circles intersect, the intersected area will have red colour. 2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour. Which of the statements given above is/are correct?

Consider the following statements: 1. A flute of smaller length produces waves of lower frequency. 2. Sound travels in rocks in the form of longitudinal elastic waves only Which of the statements given above il/are correct?

Which of the following types is used by computed tomography employed for visualisation of the internal structure of human body?

Which one of the following is printed on a commonly used fluorescent tube light?

Which of the following pairs are correctly matched? | Inventor | Invention 1. | Christopher | Hovercraft Cockerel 2. | David Bushnell | Submarine 3. | J. C. Perrier | Steamship

What does the term Dolby B or Dolby C printed on tape- recorders and other sound systems refer to:

In which one among the following is the speed of sound maximum?

Consider the following statements: 1. The axis of the Earth's magnetic field is inclined at 23½° to the geographic axis of the Earth. 2. The Earth's magnetic pole in the Northern Hemisphere is located on a peninsula in Northern Canada. 3. The Earth's magnetic equator passes through Thumba in South India. Which of the statements given above is/are correct?

Consider the following statements: 1. A geo-stationary satellite is at an approximate height of 10,000 km. 2. FM transmission of music is of very good quality because the atmospheric or man made noises which are generally frequency variations can do little harm. Which of the statements give above is/are correct?

What is the order of magnitude of electric resistance of the human body (dry)?

A car is running on a road at a uniform speed of 60 km/h. The net resultant force on the car is:

A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:

Assertion (A): In our houses, the current in AC. electricity line changes direction 60 times per second. Reason (R): The frequency of alternating voltage supplied is 50 Hz. Codes:

A spherical body moves with a uniform angular velocity (() around a circular path of radius r. Which one of the following statements is correct?

An oil tanker partially filled with oil moves forward on a level road with uniform acceleration. The free surface of oil then:

Consider the following statements: 1. Steam at 100°C and boiling water at 100°C contain same amount of heat. 2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water. 3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils. Which of these statements is/are correct?

Assertion (A): The weight of a body decreases with the increase of altitude on earth. Reason (R) : The earth is not a perfect sphere. Codes:

Consider the following statements: A 4-wheel vehicle moving in a sharp circular path at high speed will: 1. overturn about its outer wheels 2. overturn about its inner wheels 3. skid outwards 4. skid inwards Which of these statements are correct?

Which one of the following statements is not correct?

Assertion (a): Artificial satellites are always launched from the earth in the eastward direction. Reason (R): The earth rotates from west to east and so the satellite attains the escape velocity.

Which one of the following statements is correct with reference to our solar system?