UP PGT Physics Mock Test - 7 - UPTET MCQ

We know that 10⁵ dyne = 1N
And 10⁴cm²  = 1 m²
Thus we get 10 dyne / cm² = N / m²
Hence 10⁶ dyne / cm² =10⁵ N / m²

Clearly, the magnetic fields at a point P, equidistant from AOB and COD will have directions perpendicular to each other, as they are placed normal to each other.

Potential difference between two points is given by

V_a - V_b = W/q₀

Work, W = 2 J

Charge, q₀ = 20 C

Potential difference = 2/20 = 0.1 V

The correct option is C.

Let mass of earth be M
Acceleration due to gravity = g
Radius of earth = r
Height to which he can throw on earth = H
Acceleration due to gravity at the planet be = g'
Radius of the planet be= r'
Mass of the planet be = M'
Height to which he can throw at that planet = H'
Then g = G(M/r^2)
Therefore g' = G{(1/10)M}/[{(1/3)r}^2]
= (9/10) G(M/r^2)
= (9/10)g
Now, H = {(v)^2-(u)^2}/2(-g)
= {(0)^2-(u)^2}/(-2g)
= {(u)^2}/2g
H' = u^2/[2{(9/10)g}]
= (10/9)u^2/2g
= (10/9)H
= (10/9) * 90
= 100 m

Total external resistance will be the total resistance of whole length of box. It should be connected between A and D.

The initial angular momentum of the ring will be:
L_i​=mR²ω
whereas the final angular momentum is given as:
L_f​=mR²ω_new​+2MR²ω_new​
Conserving angular momentum
mR²ω=(mR²+2MR²)ω_new​
⇒ω_new​=m​ω/m+2M

From the given graph we get that the area of the given graph is total distance covered that is 
=  ½ x 10 x 12
=  60m
And total time taken is 10 sec
Thus average speed is  60m / 10sec
 = 6 m/s

The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.
Option C is the closest so the answer is option C.
 

Mass of the block = 2 kg

Weight of the block = mg = 2 × 9.8 = 19.6 N

The component of the weight along normal = 19.6 Cos 30° = 16.97 N

Hence, the normal force (N) = 16. 97 N

Now, the component of the weight along the inclined plane = 19.6 Sin 30°

Along the inclined plane = 9.8 N

Now, the friction = μ N = 0.7 × 16.97 = 11.87 N

Since, 9.8 N is less than the maximum value of the friction (11.87 N)

Hence, the frictional force = 9.8 N

5 km is the distance covered in 5 mins, which means 1 km is the distance covered in 1 min
Hence, it will travel 60 km in 60 mins, i.e. speed = 60 km/hr

KEY CONCEPT : Use Fleming's left hand rule. We find that a force is acting in the radially outward direction throughout the circumference of the conducting loop.

Explanation:Degrees of freedom of a system refers to the possible independent motions a system can have.Monoatomic gas molecule can have 3 independent motion and hence have 3 degrees of freedom (all are translational).

Answer :- a,c

Solution :- At θ=45∘,mgsinθ=1×cosθ

At θ>45∘,mgsinθ=1×cosθ (friction acts upward)

At θ<45∘,mgsinθ=1×cosθ (Friction acts downward)

xa=gsinθ−μgcosθ

In series, cells are joined end to end so that the same current flows through each cell.  In case if the cells are connected in series the emf of the battery is connected to the sum of the emf of the individual cells. Suppose we have multiple cells and they are arranged in such a way that the positive terminal of one cell is connected to the negative terminal of the other and then again the negative terminal is connected to the positive terminal and so on, then we can that the cell is connected in series.

Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter; with frequencies between 300 MHz (1 m) and 300 GHz (1 mm). Different sources define different frequency ranges as microwaves; the above broad definition includes both UHF and EHF (millimeter wave) bands.
Answer B and D both are correct.

Explanation:A particle with a vertical and horizontal velocity travelling in a gravitational field will trace out a parabola.

The process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.

Stress is the force per unit area experienced by the body and strength is the ability to withstand the stress. When stress becomes greater than strength, accidents happen.

We have given in the information that the person is in his office for two hours hence his position must not vary for two hours, that is the horizontal part in the graph which is only observed in the graph of option c.

There is no force which can balance the weight of m₁.  

Area of magnification, 
A₁​A₂=μ²
A₁/6​​=100
A_1​=600 cm²

Harmonic motion is the natural motion of a body(we consider no air friction) under no force where as damped oscillation are under force hence the iscilation are different

As 'at' and 3 are added in the equation, we get at and 3 have same dimensions i.e.1
Thus a has dimensions same as 1/t.

Maximum acceleration = w2A
Maximum velocity = wA
Ratio = w2A/wA = w
w = angular velocity
A = amplitude

W = MB(cos θ₁ - cosθ₂ )

= MB(cos 0° - cos 60°) 

Incident frequency=work function + kinetic energy.
incident frequency=E.
therefore, hc/λ=E
for energy in e.v & wavelength in Angstrom...
Now,
we know,
E=12400/λ Å
E(in e.v)=12400/1000.=12.4e.v

If an equation fails this consistency test, it is proved wrong, but if it passes, it is not proved right.

Thus, a dimensionally correct equation need not be actually an exact (correct) equation, but a dimensionally wrong (incorrect) or inconsistent equation is definitely wrong.

We know that coefficient of viscosity (η)= Fr/Av where F = tangential force, r = distance between the layers , v = velocity and A is the area of the surface.
 Thus we get [η] = MLT^-2.L / L². (L/T)
= M / LT
Thus its unit is kg / m sec