Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 A current carrying write loop is placed in between the poles of a magnet as shown in the figure below. The direction of current flow is also shown in the figure with respect to the axis, the wire loop will tend to. Rotate clockwise Note move at all Rotate anti-clock wise Move towards magnetic north
2 A current flowing in an electrical component increase linearly from 0 to 5 A over 5 second s.The total charge flowing through the component over this duration is. 5 scoulombs 12.5 coulombs 10 coulombs 25 coulombs
3 A constant current of 1 ampere flow in an electrical component over a period of 5 seconds. The total charge flowing through the component over this duration is. 5 coulombs 15 coulombs 10 coulombs 20 coulombs
4 Monochromatic light of wavelength 1 in vacuum is incident on the surface of glass at an angle 1. Assuming the refractive index of glass is 1.5 the wavelength of the refracted ray in glass is. 1/1.5 1 1.5<sub>1</sub> There is no refracted ray
5 White light is directed at a diffraction grating at an angle normal to the grating starting at the normal to the grating (0o), the order of red, green and blue lights in the diffracted spectrum is. Red, green, blue Green, blue, Red Red, blue, green Blue , green, red
6 The lines of a difference grating have a spacing of 1.2 m. When a beam of monochromatic light is incident normally on the grating. The first order maximum monochromatic light is. 1200 nano meters 450 meters 600 nano meters 700 nano meters
7 Two progressive waves of frequency 250 Hz are superimposed to produce a stationary wave in which adjacent nodes are 2 m apart. The speed of the progressive waves is. 125 m/se 500 m /sec 250 m/sec 1000 m/sec
8 A sphere of mass m and velocity 2 V moving in the x direction collides with a sphere of mass 2m and velocity v moving in the direction. It the collision is perfectly elastic, which of the following statements in correct The two spheres sticks together after impact The total kinetic energy before the impact in 3 mv3 The total momentum before impact is 4 mv Both B and C
9 With reference of figure P-1 which of the following statements relating the average velocity for the complete path and the instantaneous velocity at point Velocity at point C is true. The average velocity and the instantaneous velocity of C are equal The relation depends upon the mass of the toy car The average velocity is greater than the instantaneous velocity at C equal The instantaneous velocity at C is greater than the average velocity.
10 In an experiment the uncertainty in the value of a resistor is 2% furthermore, the uncertainty in the potential difference across the same resistor is 1% . The uncertainty in the power loss in the resistor is. Approximately 3% Approximately 5% Approximately 4% Approximately 6%
11 A mass of a liquid of density is mixed with an equal mass of another liquid of density 3. The density of the liquid mixture is. 1 3/2 p 2 4
12 Two satellites are to be launched into space from the surface of eatth satellite 1 has mass 10 kg and volume 1500 cm3. While satellite 2 has mass 5 kg and volume 1000 m3. Assume the required escape velocities of satellite 1 and satellite 2 are v 1 and v2 , respectively. The relation between v1 and v2 is. Relation depends on the launch V1&gt;V2 V1 = V2 V1 &lt;V2
13 An ambulance moves around a large round-about with its sirens on . For a person standing at the center of the round about, the frequency of ambulance siren heard will be. Equal to the actual siren frequency Less than the actual siren frequency Greater than the actual siren frequency Changing as the ambulance moves frequency
14 A uniform bar AE of weight 9 N is held horizontal by vertical forces. Two additional force act A and D as shown in figure. The points A,B,C,D and E are at equal intervals along the bar. At which point must vertical force of 6 N act to keep bar in equilibrium. Point D Point E Point C Point B
15 A tight wire is clamped at two points 2.0 m apart. It is plucked near one end. Which are the three longest wavelengths present on the vibrating wire. 2.0 m, 1m, 0.67 m 4.0 m, 2.0 m, 1m 4.0 m, 2.0 m, 1.33 m 1m, 0.5 m ,0.33 m
16 Which one of the following is not a vector quantity? Kinetic energy Acceleration Momentum Force
17 A thermistor with positive temperature coefficient in used to measure temperature in a furnace. As the furnace heats up, the resistance value fo the thermistor. Decrease Remains unchanged Increase None of the above
18 You have 20 capacitors available with you, each of 15 F, You need a capacitor of around 1F in a circuit. You can achieve this value by connecting 15 capacitors in parallel 15 capacitors in series 20 Capacitors in series 20 Capacitors in parallel
19 An Astronaut in space comes to know of an explosion on nearby planet. The astronaut came to know about this explosion becuase. The astronaut saw, heard and felt the explosion The astronaut only saw the explosion The astronaut only heard the explosion The astronaut both saw and heard the explosion
20 When spectrum of hydrogen atom is taken in magnetic field, some new lines are created. This is called. Resonance effect Stark effect Zeeman's effect Electric effect
21 Most ideal gas at room temperature is. CO2 SO2 NH3 H2
22 Speed of Sound in vacuum is. 332 m sec -1 0. m sec-1 340 m sec-1 350 m sec-1
23 A body absorbs heat a constant temperature , then this phenomenon will be. Melting point Evaporation Boiling point Both A and B
24 Which of the following friction is self-adjusting force. Static Dynamic Limiting Sliding
25 The wavelength of wave is 5000 Ao. This wave will be in region U.V Visible Radio Infrared
26 The time period of pendulum, at center of earth. Zero Infinite Maximum Minimum
27 Which of the following should remain constant if no torque acts upon a body. Linear constant Momentum Angular momentum Charge
28 The maximum value of drag forcer on an object is 9.8 N . What will be the value of its mass? 9.8 Kg 2 kg 4 Kg 1 Kg
29 A particle is moving in a straight line with velocity v = (4-t2) where t is the time from fixed point then acceleration of the particle after 4 sec is. -8 m/sec2 -4 m/sec -8 m/sec - 4 m /sec2
30 A mixture of two gases at constant temperature contains molecules of two kinds. The first kind of mass m1 nd rms speed c1 and the second molecule has mass m2 and rms speed c2, the ration c1/c2 is. m1/m2 [m1/m2]<sup>1/2</sup> m2/m1 [m2/m1]1/2
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