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The resultant force of 5N nd 10N cannot be: 1)12N 2)8N 3)4N 4)5N

Answer: 3)4N Let the vectors p and q be the two forces and r is the resultant force. Now as per the question, p = 5N and q = 10N Thus,... View Article

Kirchhoffs second law is based on the law of conservation of: (A) Charge (B) Momentum (C) Energy (D) Sum of mass and energy

Answer: (C) Energy Kirchhoffs second law is based on the law of conservation of energy. Learn more: Kirchoff's Second Law... View Article

Difference between manometer and barometer

Barometer Manometer A barometer is an instrument used to measure the air pressure as it varies with distance either above or below sea... View Article

What is the dimensional formula of resistivity?

The dimensional formula of resistivity of conductor is M1L3T-3A-2 where M = Mass L = Length T = Time A = Current... View Article

What do you mean by Sound ?

A sound is a vibration that propagates through a medium in the form of a mechanical wave. The medium in which it propagates can either be a... View Article

Amount of light entering the eye is controlled by: (a) Iris (b) Cornea (c) Pupil (d) Crystalline lens

The amount of light entering the eye is controlled by pupil. Hence, the correct option is (c)... View Article

Give examples of force changing the direction of a moving object

The examples of force changing the direction of a moving object are 1. In cricket, when a batsman hit the ball with a bat, the direction of the... View Article

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 ms^-1 to 20 ms^-1 while passing through a distance 135 m in t second. The value of t is: (a) 12 (b) 9 (c) 10 (d) 1.8

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 ms-1 to 20 ms-1 while passing through a... View Article

Ray optics is valid when characteristic dimension are: (a) much smaller than wavelength of light (b) of same order as wavelength of light (c) much larger than wavelength of light (d) none of the above

Ray optics is valid when characteristics dimension are much larger than wavelength of light. Therefore, the correct answer is option (c)... View Article

What are the properties of image formed by a plane mirror?

Properties of an image formed by plane mirror are 1. The image obtained is virtual 2. The image is laterally inverted 3. The image is erect 4.... View Article

The force of friction between two bodies is ? (a) parallel to contact surface (b) perpendicular to contact surface (c) inclined to contact surface (d) a non contact force

The force of friction between two bodies is parallel to contact surface. Hence, the correct answer is option (a)... View Article

Why temperature is called a scalar quantity having a direction?

Scalar quantity is defined as the physical quantity with magnitude and no direction. On the other hand a vector quantity is defined as the... View Article

What is the condition for pure rolling?

The process of rolling where no sliding is seen is referred to as pure rolling. Pure rolling is the combination of translation and rotation... View Article

Force acting on the particle moving with constant speed in a straight line path: (a) Always zero (b) Need not to be zero (c) Always non zero (d) Cannot be concluded

Answer: (a) Always zero If the particle is moving at constant speed along a straight line path, that means the velocity is also constant.... View Article

The device used for measuring potential difference is known as: (a) Galvanometer (b) Ammeter (c) Potentiometer (d) Voltmeter

Answer: (d) Voltmeter Also, learn: Types of Voltmeter... View Article

Which type of force is exerted by electrostatic charge?

The force is exerted by electrostatic charge or electrically charged object is called electrostatic force. Also, learn: What is Electrostatic force?... View Article

Two particles execute SHM of same amplitude and frequency along the same straight line from same mean position. They cross one another without collision, when going in opposite direction, each time their displacement is half of their amplitude. The phase-difference between them is:

Let equations of motion of two particles be x=Asinωt ..........(i) x=Asin(ωt+ϕ) .........(ii) Putting x=A/2 in equation (i),... View Article

The electric potential v at any point (x y z), all in meters in space is given by V = 4x² volt. The electric field at the point (1, 0, 2) in volt/meter is (a) 8 along negative X-axis (b) 8 along positive X-axis (c) 16 along negative X-axis (d) 16 along positive X-axis

Answer: (a) 8 along negative X-axis The electric field at general point (x, y, z) Potential function (V) = 4x2 Therefore, electric field... View Article

Electrons of mass m with debroglie wavelength lambda fall on the target in an X-rays tube. The cut-off wavelength λ₀ of the emitted X-rays is: (a) λ₀ = λ (b) λ₀ = 2mcλ²/h (c) λ₀ = 2h/mc (d) λ₀ = 2m²c²λ³/h²

Let Ek be the kinetic energy of the electron Its linear momentum, p = √2mE Using de-broglie wavelength λ = h/p λ =... View Article

According to the Schrodinger a particle is equivalent to: (a) a wave (b) a particle only (c) both of them (d) none of them

(a) a wave According to Schrodinger, a particle is equivalent to a wave. Schrodinger wave equation is a mathematical expression describing the... View Article

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